Homework Help: Math: Statistics

Recent Homework Questions About Statistics

Statistics
The actual weights of bag of pet food are normally distributed.The mean of the weights is 50.0 lb,with a standard deviation of 0.2 lb. B) In a group of 250 bags,how many would you expect to weigh more than 50.4 lb?
Monday, June 4, 2012 at 8:12pm

Statistics
The actual weights of bag of pet food are normally distributed.The mean of the weights is 50.0 lb,with a standard deviation of 0.2 lb. A)About what percent of bags of pet food weigh less than 49.8 lb?
Monday, June 4, 2012 at 8:11pm

statistics
98,99,99,103,101,102,104,89,87,90,90 Find the 25th and 75th percentiles. Within how many standard deviations of the mean is the value 102. Find the interquartile range.
Monday, June 4, 2012 at 8:09pm

statistics
The actual weights of bags of pet food are normally distributed.The mean of the weights is 50.0lb,with a standard deviation of 0.2lb. Sketch a normal cuve for the distribution.Label the x-axis at one,two,and three standard feciation from the mean,in addition label all the ...
Monday, June 4, 2012 at 8:07pm

statistics
A person who has served three consecutive terms of four yrs shall be eligible for appointment, nomination for or election to the office of council-member no sooner than for a term beginning eight years after completion of that council member's third consecutive full term. ...
Monday, June 4, 2012 at 7:18pm

Bus Stat
Statistics: Many track hurdlers believe that starting in the inside lane closest to the field has better chance of winning. closest to the field is lane 1, nxt is lane 2, etc until Lane 6. find the critical value x20 to test the claim that the possibilities of winnin are the ...
Sunday, June 3, 2012 at 9:47pm

Statistics
The call letter of a radio station must have 4 letters.The first letter must be a K or a W. How many different station call setters can be made if repetitions are not allowed? If repetitions are allowed?
Sunday, June 3, 2012 at 7:21pm

college statistics
a set of data is normally distributed with a mean of 1000 and a standard deviation of 100.what would be standard score for a score of 900.what percent of scores is betyween 1000 and 900.what would be percentile rank for a score of 900.
Sunday, June 3, 2012 at 4:51pm

statistics
of the physics graduates of a university, 35% received a starting salary of $50,000 or more. If 5 of the graduates are selected at random, find the probability that all had a starting salary of $50,000 or more.
Sunday, June 3, 2012 at 4:06pm

statistics
Reading placement scores for a particular college are normally distributed with a mean of 72 and a standard deviation of 7. a) draw a sketch of the reading placement scores for students at this college. be sure to mark the mean and also to mark one and two standard deviations ...
Sunday, June 3, 2012 at 10:39am

Statistics
Assume that a population is normally distributed with a mean of 100 and a standard deviation of 15. Would it be unusual for the mean of a sample of 3 to be 115 or more? Why or why not?
Sunday, June 3, 2012 at 1:49am

statistics
Formulate and test a hypothesis to determine if statistical evidence suggests that the graduation rate for either top liberal arts colleges or research universities in the sample Colleges and Universities exceeds 90%. Do the data support a conclusion that the graduation rate ...
Friday, June 1, 2012 at 7:19pm

statistics
If the city spends $145,000 on promotional expenditures, what will be the projected attendance at 95% confidence level? how to calculate this using excel?
Friday, June 1, 2012 at 4:26pm

statistics
Given a level of confidence of 99% & a population standard deviation of 10, answer the following: (A)What other information is necessary to find the sample size (n)? (B)Find the Maximum Error of Estimate (E) if n=77. show all work.
Wednesday, May 30, 2012 at 7:44pm

statistics
. A random sample of 30 students obtained the following marks in a class test : (20) Test the hypothesis that their median score is more than 50. 58 55 25 32 26 85 44 80 33 72 10 42 15 46 64 39 38 30 36 65 72 46 54 36 89 94 25 74 66 29
Tuesday, May 29, 2012 at 1:57am

statistics
Which hypothesis-testing procedure would you use in the following situations? • The mean time an American family lives in a particular single-family dwelling is 11.8 years. A sample of 100 families in the Sycamore, OK area shows the mean time living in a single family ...
Tuesday, May 29, 2012 at 12:09am

statistics
a kind of tire has a 80% probability of exploding after 20000 miles. What is the probability that a set of 4 tires will last longer that 20000 miles without any of tham exploding?
Monday, May 28, 2012 at 11:15am

statistics
a manufacturer of detergent claims that the contents of the boxes in the market weigh on average at least 16 oz.. the distribution of weights is known to be normal with a standard deviation of 0.4 oz. to test the claim of the manufacturer a random sample of 16 boxes were ...
Monday, May 28, 2012 at 10:26am

statistics
Urn I and Urn II each have 2 red chips and 2 white chips. Two chips are drawn simultaneously from each urn. Let X1 be the number of red chips in the first sample and X2 the number of red chips in the second sample. Find the pdf of X1 + X2
Monday, May 28, 2012 at 2:19am

statistics
The average commute time via train from the chicago O'Hare Airport to downtown is 60 minutes with a s=15 minutes.Assume that the commute times are normally distributed. what proportion of commutes would be: a. Longer than 80 minutes?
Sunday, May 27, 2012 at 8:01pm

Statistics
What is the APA statement, hypothesis, and error for z score -2.50 and p value 0.006?
Sunday, May 27, 2012 at 5:55pm

college statistics
construct a scatterplot for x,y values x 1 2 3 4 5 y 0.5 0.0 -0.5-1.0-1.5 what would be the slope of this regression line would the correlation between xand y be postive oe negative how would you interpret these data in terms of regression
Saturday, May 26, 2012 at 3:28pm

college statistics
if the correlation co-efficient is o.32 what is the sign of the slope regression line as the correlation co efficient decreases from 0.78 to 0.71 do the oints of the scatter plot move toward the regression line or away from it
Saturday, May 26, 2012 at 10:19am

Statistics
A number of cashiers at a chain of grocery stores complained about the working conditions (shift length, design of cash registers, etc.), claiming that they resulted in back pain in at least 80 percent of cashiers. The employer, trying to show that that claim is not true, ...
Friday, May 25, 2012 at 10:25am

Statistics
Using a sample of recent university graduates, you estimate a simple linear regression using initial annual salary as the dependent variable and the graduate's weighted average mark (WAM) as the explanatory variable. If the regression model has an estimated intercept of ...
Friday, May 25, 2012 at 12:17am

statistics (college
An insurance company checks police records (in a city) on 500 accidents selected at random and notes that teenagers were at the wheel in 120 of them. It is desired to test if this information indicate that more than 20% of auto accidents involve teenage drivers in the city. ...
Wednesday, May 23, 2012 at 9:32pm

statistics
24 HOURS A DAY. THE WORKERS PRODUCE 50,000 SHOES EVERY 2.3 DAYS. HOW MANY DAYS DOES IT TAKES TO PRODUCE 50,000 SHOES?
Wednesday, May 23, 2012 at 12:06pm

Math
Unit 2 Individual Project Deliverable Length: 3 pages Details: Using our data set from Unit 1, compose a 3-page e-mail to the head of the American Intellectual Union, which includes the following: 1. Begin your e-mail to AIU by first providing an overview of the database, that...
Wednesday, May 23, 2012 at 9:55am

statistics
.) A hospital in a large city records the weight of every infant born at the hospital. The distribution of weights is normally shaped, with a mea n µ= 2. 9 kilograms and a standard deviation o- = 0 .45. Determine the following: a. The percentage of infants who weighed ...
Wednesday, May 23, 2012 at 4:29am

Statistics
The Arcade shack is a manufacturing plant located in San Diego where 800 factory workers are employed. The personnel department selected 36 factory employees at random for the statistical study. construct a 95% interval for the percentage of males in the 800.
Wednesday, May 23, 2012 at 1:52am

statistics college
SATI SCORES AROUND THE NATION HAVE A MEAN SCORE AROUND 500 A STANDARD DEVIATION OF ABOUT 100 POINTS AND ARE APPROXIMATELY NORMALLY DISTRIBUTED A PERSON WHO SCORES A PERFECT SCORE OF 800 ON THE SAT I HAS APPROXIMATELY WHAT PERCENTILE RANK WITHIN THE POPULATION
Tuesday, May 22, 2012 at 9:50pm

statistics college
find the range standard deviation and variance for following sample data 2,11,81,29,22,59,78,71,21,43,99,12,38,74,56,81
Tuesday, May 22, 2012 at 9:47pm

statistics college
suppose we have a set of blood pressure set with a mean of 120 systolic and a sample standard deviation of 20 points assume a normal distribution of what two values should 95% of all systolic bp lie
Tuesday, May 22, 2012 at 9:44pm

statistics
How do you calculate the slope and intercept of a regression?
Tuesday, May 22, 2012 at 8:30pm

Statistics
A lottery uses 4 urns containing chips 0 to 9. One chip is selected at random from each urn. How many sample points are in the sample space?
Tuesday, May 22, 2012 at 12:34pm

statistics
what is a critical value
Tuesday, May 22, 2012 at 7:29am

statistics
suppose 25% of the urban population is 18 years old or younger. five residents of that city are selected at random find the probability that at least two of the selected five persons are 18 years old or younger. please help me with this question !!!
Tuesday, May 22, 2012 at 3:52am

citing on a research paper
Hi, I am a bit confused on how and when to cite sources on my research paper. For example, I have a small paragraph where I got the statistics from a website but I put it into my own words. So do I put a ( ) after each sentence or after the whole paragraph? And I have to cite ...
Monday, May 21, 2012 at 10:15pm

statistics
Bob scores 610 on his SAT's. If the mean score is 580 and the standard deviation is 115, what percentile is Bob's SAT score?
Monday, May 21, 2012 at 9:21pm

Statistics
Does a football filled with helium travel farther than one filled with ordinary air? To test this, the Columbus Dispatch conducted a study. Two identical footballs, one filled with helium and one filled with ordinary air, were used. A casual observer was unable to detect a ...
Monday, May 21, 2012 at 4:44pm

statistics
John wants to advocate for making study rooms available to students. In an effort to learn whether the time of day or the day of the week would be most important to consider in deciding when to make such rooms available, he polls a randomly selected group of students to find ...
Sunday, May 20, 2012 at 10:15pm

statistics
Sign in Assume that the mean score on a certain aptitude test across the nation is 100, and that the standard deviation is 20 points. Find the probability that the mean aptitude test score for a randomly selected group of 150 8th graders is between 99.5 and 100.5. Sign in
Sunday, May 20, 2012 at 6:24pm

statistics
In a survey of 400 college students, 40 were left-handed. Treating the sample as if it were random and using 0.015 as the standard deviation of the sampling distribution of the sample proportion, what is the lower bound of a 95% confidence interval for the population proportion?
Friday, May 18, 2012 at 10:19pm

Statistics
A researcher found a sample proportion of 0.94 for estimating the population proportion of freshmen at a university who had Facebook accounts. If the standard deviation of the sampling distribution of the sampling proportion is 0.02, what is a 95% confidence interval for the ...
Friday, May 18, 2012 at 5:09pm

Statistics
From random sample of 200 college students, 40 students indicated that they smoke cigarettes. Use the information from the sample to calculate a 95% confidence interval for the population proportion of college students that smoke cigarettes (round to nearest hundredth). A. (0....
Friday, May 18, 2012 at 5:05pm

Statistics
1000 scientists create 95% confidence intervals for parameters of interest. If they all compute the confidence intervals correctly, how many of the intervals would we expect to contain the true population parameter? A. 950 B. 0 C. 95 D. 1000
Friday, May 18, 2012 at 5:04pm

Statistics
Which of the following statements best describes the uncertainty associated with a 95% confidence interval for a population proportion, computed from a simple random sample? A. We don't know whether the particular confidence interval is successful or not, but 95% of ...
Friday, May 18, 2012 at 5:02pm

Statistics
A Gallup Poll reported the percentage of Americans who approve of the President's job performance was 47% with a margin of error of 2 percentage points. What is a 95% confidence interval for the population percentage? A. 41% to 53% B. 45% to 49% C. 46% to 48% D. 43% to 51%
Friday, May 18, 2012 at 5:00pm

Statistics
In a poll of 1,000 adults, 57% believed that there was too much inappropriate content on TV. A 95% confidence interval for the proportion is given as 0.54 to 0.60. What is the margin of error of this poll? A. 0.54 B. 0.015 C 0.03 D. 0.57
Friday, May 18, 2012 at 4:58pm

Probability and Statistics
A package contains 12 resistors, 3 of which are defective. If four are selected, find the probability of getting the following. No defective resistors One defective resistors 3 defective resistors
Thursday, May 17, 2012 at 11:02pm

statistics
Suppose the mean height of a population is 65 inches with a standard deviation of 1.5 inches. What is the z value for a height (x) of 67 inches?
Tuesday, May 15, 2012 at 11:13pm

statistics
consider a sample mean of xbar of 46 calculated from a sample of size 35 drawn from a population of over 1000. Would it be appropriate to use the standard score table to look up the probability of a z score calculated on these data? Why or why
Tuesday, May 15, 2012 at 8:05pm

statistics
determine if this statistical study is descriptive or inferential a study finds that 51% of registered voters favor candidate x over candidate y
Tuesday, May 15, 2012 at 4:12pm

Statistics
The Centers for Disease Control and other organizations are interested in the health benefits of breastfeeding for infants. The National Immunization Survey includes questions about breast-feeding practices, including the questions about breast-feeding practices, including the...
Tuesday, May 15, 2012 at 8:51am

statistics
no. of 10 resturants surveyed in city of lucknow and found that average food wastage per day is 35 kg with variance as 3 kg . is it reasonable to assume that the daily mean wastage of food in a resturant is 38 kg ? test @5% significance level.
Monday, May 14, 2012 at 11:59pm

statistics
a random sample of 100 students from the current years batch gives the mean IQ level of 110 and variance of 5 can we say that this is same as the IQ of the previous batch which was 116.
Monday, May 14, 2012 at 11:55pm

statistics
A simple random sample of 50 items from a population with σ 6 resulted in a sample mean of 32. a. Provide a 90% confidence interval for the population mean
Monday, May 14, 2012 at 11:20pm

statistics
you have requirement that men must be at least 74 in tall and women must be at least 70 in tall. the men height is 69 in +/-2.8 and women mean height is 63.6 +/-2.5. If the requirement s changed so that the tallest 4% of men and women are eligible, what would be the new ...
Monday, May 14, 2012 at 10:47am

statistics
Suppose that the certain lifetimes of a certain light bulb are normally distributed with μ=1500 hours and σ=200. Find the probability that a light bulb will burn out in less than 1200 hours.
Monday, May 14, 2012 at 8:12am

statistics
a sales manager wants to know whether a special promotional campaign is a success. he had the following data-Retail outlets :1 2 3 4 5 6 ; Sales before campaign : 50 48 31 42 28 53 ; Sales after campaign : 56 55 30 45 29 58. Test at 5% LOS.
Monday, May 14, 2012 at 8:03am

statistics
Compare the standard deviation for the heights of males and the standard deviation for the heights of females in the class. Compare the values and explain what can be concluded based on the numbers. female 2.541 male 4.21
Sunday, May 13, 2012 at 9:45pm

Statistics
Having problems reading the z-table. I don't understand how .1500% equates to a 1.04 z-score Thank you for your help
Sunday, May 13, 2012 at 7:53pm

statistics
the probability that a voting-age adult in 2008 voted in the presidential election was .57. Five voting age adults in 2008 were randomly selected. Find the probability that exactly 2 of the 5 adults voted in the presidential election.
Sunday, May 13, 2012 at 7:49pm

statistics
Transformation
Sunday, May 13, 2012 at 12:42pm

Statistics
M80,sd10,s8,n25 how do I calculate the sampling distribution parametes
Sunday, May 13, 2012 at 9:27am

statistics
suppose the replacement times for washing machines are normally distributed with mean 8.6 years and standard devistion of 1.6years. a. what percentage of washing machines have replacement times less than 7 years? b. find the probability that a washing machine will have a ...
Saturday, May 12, 2012 at 10:00pm

statistics
a company manufactures batteries in batches of 18 and there is a 3% defect rate. Find the standard deviation for a number of defects per batch?
Saturday, May 12, 2012 at 8:46pm

Statistics
In 1972, there were 3.4 trillion cigarettes purchased worldwide, and in 1984, there were 4.3 trillion cigarettes purchased worldwide(in trillions) in the year x, where x=0 represents the year 1972. (a) Which of the following linear equations could be used to predict the number...
Saturday, May 12, 2012 at 7:35pm

statistics
A group meeting is attended by 16 delegates. (a)If a 6-person negotiation panel is selected at random from the 16 delegates, what is the probability the negotiation panel consists of 3 delegates from Atlantis and 3 delegates from Zedonia?
Saturday, May 12, 2012 at 7:22pm

Information Literacy
1-To determine the best place to begin your online research, you should first A. identify keywords and search terms. B. formulate your research question. C. choose several verbs and modifiers to help define your search. D. settle on a single, concise search term or phrase. My ...
Saturday, May 12, 2012 at 7:20pm

statistics
8. Compare the mean for the heights of males and the mean for the heights of females in these data. Compare the values and explain what can be concluded based on the numbers. Comparing the mean of height between male and female shows that the average height of a female in this...
Saturday, May 12, 2012 at 3:25pm

Statistics
A research center claims that 50% of people believe that drivers should be allowed to use cellular phones with hands free devices while driving. In a random sample of 150 U.S. adults 58% say that drivers should be allowed to use cellular phones with hands free devices while ...
Friday, May 11, 2012 at 3:28pm

statistics
a mean score on a standardized test is 50 with a standard deviation of 10. What are the following: 1. what scores fall between -1 and +1 standard deviation? 2. what percent of all scores fall between -1 and +1 standard deviation? 3. what score falls at +2 standard deviations? ...
Friday, May 11, 2012 at 12:06pm

statistics
a final exam in statistics has a mean of 73 with a standard deviation of 7.73. Assume that a random sample of 24 students is selected and the mean test score of the sample is computed. What percentage of sample means are less than 70?
Friday, May 11, 2012 at 11:51am

Statistics
A random sample of 16 mid-sized cars tested for fuel consumption gave a mean of 26.4 kilometers per liter with a standard deviation of 2.3 kilometers per liter. i) Assuming that the kilometers per liter given by all mid-sized cars have a normal distribution, find a 99% ...
Friday, May 11, 2012 at 12:56am

Statistics
In 2002, the average price of new homes in a certain suburb was $145,000. Assume that this mean is based on a random sample of 1000 new home sales and that the sample standard deviation is $24,000. Construct a 95% confidence interval for the 2002 mean price of all such homes
Friday, May 11, 2012 at 12:55am

statistics
A construction zone on Kings Road has a posted speed of 45 kilometers per hour. The speeds of vehicle passing through this construction zone are normally distributed with a mean of 46 kilometers per hour and a standard deviation of 4 kilometers per hour. Find the percentage ...
Friday, May 11, 2012 at 12:53am

statistics
A fair die is tossed and the number facing up is noted. If the probability of getting at least one ‘six’ is to exceed 0.9, how many times should the die be tossed.
Friday, May 11, 2012 at 12:50am

statistics
survey showing the IQ of each person interviewed and the IQ of his or her mother. That is all the information you have. Your boss has asked you to put together a report showing the relationship between these two variables. What could you present and why?
Thursday, May 10, 2012 at 9:27pm

statistics
The data set for the study is a sample of a survey conducted on the population of the American Intellectual Union (AIU). It is available via the following link: Excel 2007 DataSet with DataSet Key which contains the following nine sections of data that will be used throughout ...
Thursday, May 10, 2012 at 7:18pm

statistics
A medical board claim that the mean number of hours worked per week by surgical faculty who teach at an academic institution is more than 60 hours. A random sample of 7 surgical facility has a mean hours worked per week of 70 hours and a standard deviation of 12.5 hours. At a=...
Thursday, May 10, 2012 at 3:18pm

writing
Which of the following statements is not a general rule for using statistics in a classroom speech? A The more statistics the better. Use statistics sparingly Make sure information is up to date Round off long numbers.
Thursday, May 10, 2012 at 12:28pm

writing
When citing statistics from a web page in your speech you need to provide which of the following: ALL The date and source of the statistic What population(s) the statistic represents The author responsible for the statistic or quotation
Thursday, May 10, 2012 at 12:21pm

writing
When multiple statistics use to describe something, it is the best practice to… ALL Have a visual aid so your audience can see them easily Tell the numbers sequentially. Explain it thoroughly.
Thursday, May 10, 2012 at 12:00pm

writing
true or false 1) Charts, tables and graphs are effective methods of clarifying facts and statistics. TRUE 2) Wikipedia is an acceptable source to cite in a speech. FALSE 3) When finding and evaluating research; information from an unknown blog is acceptable. FALSE 4) Fair use ...
Thursday, May 10, 2012 at 11:46am

statistics
If the average number of textbooks in professors offices is 16 with a standard deviation of 5; and the average age of professors is 43 with a standard deviation of 8. Calculate the covariance of the number of textbooks in professors offices (show your work and formulas used) ...
Thursday, May 10, 2012 at 8:50am

statistics
Suppose that 98% of your customers in your market have internet access and you select a random sample of 500 customers. What is the standard error of the proportion of customers who don’t have internet access? I seem to be struggling with no standard deviation listed
Thursday, May 10, 2012 at 8:45am

statistics
On Wednesday afternoons last year a teacher regularly took her class out to study traffic flow through a small village. Her studies established that lorries pass through the village at a rate of 1.5 per 5-minute period on Wednesday afternoons. This year she had to take her ...
Thursday, May 10, 2012 at 7:39am

statistics
A researcher conducted a study of the access speed of 40 hard drives and concluded that his maximum error of estimate was 15. If he were to conduct a second study to reduce the maximum error of estimate to 5, about how many hard drives should he include in his new sample?
Thursday, May 10, 2012 at 6:08am

statistics
A random sample of 16 mid-sized cars tested for fuel consumption gave a mean of 26.4 kilometers per liter with a standard deviation of 2.3 kilometers per liter. i) Assuming that the kilometers per liter given by all mid-sized cars have a normal distribution, find a 99% ...
Thursday, May 10, 2012 at 6:07am

statistics
The data below are the ages of a random sample of 8 men in a bar. It is known that the population of ages are normally distributed with a standard deviation of 11. Determine the 93% confidence interval estimate of the population mean. 50 70 22 36 59 39 27 47
Wednesday, May 9, 2012 at 11:55pm

statistics
The number of cars sold annually by used car salespeople is normally distributed with a standard deviation of 18. A random sample of 310 salespeople was taken and the mean number of cars sold annually was found to be 71. Find the 94% confidence interval estimate of the ...
Wednesday, May 9, 2012 at 11:47pm

Statistics
A large furniture store has begun a new ad campaign on local television. Before the campaign, the long term average daily sales were $24,819. A random sample of 40 days during the new ad campaign gave a sample mean daily sale of x(bar)=$25,910 with sample standard deviation s...
Wednesday, May 9, 2012 at 8:21pm

statistics
psychologist wants to interview subjects with IQ scores are normally distributed with mean of 100 and standard deviation of 15. find the score that separating the top of IQ frin the bottom 90%
Wednesday, May 9, 2012 at 12:55pm

Statistics
A jar contains 12 marbles, 5 of which are blue and 7 of which are red. If 4 marbles are chosen at random and without replacement, what is the probability of selecting 3 blue ones and 1 red one?
Wednesday, May 9, 2012 at 10:25am

Statistics
Compute a one-way ANOVA - Give the source table, test null hypothesis at .05 level. Please explain the steps to solving this. Group 1: 26, 34, 46, 48, 42, 49, 74, 61, 51, 53 EX 1 : 484 Ex 1^2 : 25,024 n = 10 Group 2: 51, 50, 33, 28, 47, 50, 48, 60, 71, 42 EX 2 : 480 EX 2^2 : ...
Wednesday, May 9, 2012 at 8:14am

Statistics
The returns on the NASDAQ Index and the following stocks on the NASDAQ Exchange were calculated for the period January 2001 to December 2006 are shown in Xm04-73. Amgen Ballard Power Systems Cisco Systems Intel Microsoft Calculate the beta coefficient for each stock and ...
Wednesday, May 9, 2012 at 2:29am

statistics - please help
A researcher wishes to be 95% confident that her estimate of the population proportion of individuals who travel overseas is within 4% of the true proportion. Find the sample size necessary. In a prior study, a sample of 200 people showed that 80 traveled overseas last year.
Tuesday, May 8, 2012 at 8:21pm

Statistics
a random group of seniors was selected from a university and asked about their plans for the following year. The school advising office claims that 50% of the students plan to work, 25% of the students plan to continue in school, and 25% of the students plan to take some time ...
Monday, May 7, 2012 at 11:37pm

statistics
A random group of customers at a fast food chain were asked whether they preferred hamburgers, chicken sandwiches, or fish sandwiches. The restaurant's marketing department claims that 40% of the customers prefer hamburgers, 46% of the customers prefer chicken sandwiches, ...
Monday, May 7, 2012 at 11:36pm

Statistics
Test the significance of the correlation coefficient r at a=0.05 for the data below. X values 59, 65, 73, 80, 89 Y values 97, 102, 110, 117, 125 A) Accept p=0 because 60.81<3.18 B) Reject p=0 because 61.13>3.18 C) Accept p=0 because 61.13<2.78 D) Reject p=0 because 60...
Monday, May 7, 2012 at 11:36pm

Statistics
The table list the sugar content of two types of apples from three different orchards. At a=0.05, test the claim that the sugar content of the apples and the orchard where they were grown are not related. Sugar Content------Orchard 1----- Orchard 2------Orchard 3 Apple type1...
Monday, May 7, 2012 at 11:35pm

statistics
according to data from the american medical association, 10% of us are left handed. If three people, are randomly selected find the probability that they are all left handed. If groups of 50 people are randomly selected, what is the mean and stadard deviation of left handed ...
Monday, May 7, 2012 at 8:23pm

statistics
The winning times (in seconds) of women in the 100-meter dash for consecutive summer Olympic games are listed below. Assume that the times are sample data from a larger population: 11.07 11.08 11.06 10.97 10.54 10.82 10.94 10.75 10.93
Monday, May 7, 2012 at 8:19pm

Statistics
Negative and positive deviations occur with the _______ frequency
Monday, May 7, 2012 at 8:01pm

Statistics
Normal distribution models what type of variable??
Monday, May 7, 2012 at 7:15pm

statistics
In a random sample of 112 State College students, 41 students reported being current smokers. a) Calculate the 95% confidence interval for the proportion of State College students who smoke.
Monday, May 7, 2012 at 10:44am

statistics
The distribution of scores on a standardized aptitude test is approximately normal with a mean of 490 and a standard deviation of 95. What is the minimum score needed to be in the top 25% on this test? Carry your intermediate computations to at least four decimal places, and ...
Sunday, May 6, 2012 at 11:52pm

statistics
A cellular phone manufacturer randomly selects 5 phones from every batch of 50 produced. If at least one of the phones is found to be defective than each phone in the batch is tested individually. Find the probability that the entire batch will need testing if the batch ...
Sunday, May 6, 2012 at 8:59pm

STATISTICS
A manufacturer has received complaints that aging production equipment is forcing workers to work overtime in order to meet production quotas. Historically, the average hours worked per week at the company is normally distributed, with a mean of 40 hours and a standard ...
Sunday, May 6, 2012 at 5:55pm

BUSSINESS STATISTICS
Consider the average available for all hotel rooms from the previous assignment. Identify the point estimate of the average number of available hotel rooms in this lesson from each sample. Construct and Interpret a 95% confidence level for the true mean number of available ...
Sunday, May 6, 2012 at 5:40pm

math
A sample of 64 statistics students at a small college had a mean mathematics ACT score of 28 with a standard deviation of 4. Estimate the mean mathematics ACT score for all statistics students at this college. Give the 95% confidence interval.
Sunday, May 6, 2012 at 5:38pm

statistics
Urgen!! Statistics homework help? Your company is producing special battery packs for the most popular toy during the holiday season. The life span of the battery pack is known to be Normally distributed with a mean of 250 hours and a standard deviation of 20 hours. 1) What is...
Sunday, May 6, 2012 at 5:04pm

statistics
The life span of the battery pack is known to be Normally distributed with a mean of 250 hours and a standard deviation of 20 hours. How to find the percentage of the battery packs lasting more than 250 hrs.
Sunday, May 6, 2012 at 4:31pm

statistics
a raido show host asked people to call in and wheater they support new legislation to promote cleaner sources of energy. based on this sample, she constructed a confidence interval to estimate the proportion of all listners to her show who support the legislation. is the ...
Sunday, May 6, 2012 at 3:45pm

statistics
a sample of 100 persons had a mean of 80 for a measure and the population standard deviation of 5. what ia the 99% confidence interval for the mean?
Sunday, May 6, 2012 at 3:38pm

statistics
Hannah selected a simple random sample of all adults in her town and based on this sample, consrtucted a confidence interval for the mean salary of all adults in the town. however, the distribution of salaries in the town is not exactly normal. will the confidence interval ...
Sunday, May 6, 2012 at 3:32pm

Statistics
Describe how the confidence intervals will change depending on whether the population standard deviation is known or unknown
Sunday, May 6, 2012 at 10:21am

Statistics
You have an SRS of size n = 16 from a Normal distribution with standard deviation = 1. You wish to test H_0 :Î¼ = 0 H_a :Î¼ > 0 You decide to reject H_0 if x bar > 0 and to accept H_0 otherwise. a. Find the probability of a Type I error. That is...
Sunday, May 6, 2012 at 3:37am

Statistics
Sulfur compounds cause "off-odors" in wine, so winemaker want to know the odor threshold, the lowest concentration of a compound that the human nose can detect. The odor threshold for dimethyl sulfide (DMS) in trained wine tasters is about 25 micrograms per liter of ...
Sunday, May 6, 2012 at 3:36am

Statistics
At the Statistics Canada Web site, you can find the percent of adults in each province or territory who have at least a university certificate, diploma, or degree at bachelor's level or above. It makes no sense to find x bar for these data and use it to get a confidence ...
Sunday, May 6, 2012 at 3:35am

Statistics
A randomized comparative experiment compared the effects of two types of deep-brain stimulation (pallidal stimulation and subthalamic stimulation) on change in motor function, as blindly assessed on the Unified Parkinson's Disease Rating Scale, part III (UPDRS-III). The ...
Sunday, May 6, 2012 at 3:34am

statistics
To determine how many hours per week freshmen college students watch television, a random sample of 225 students was selected. It was determined that the students in the sample spent an average of 35 hours watching TV per week. The population standard deviation is known to be ...
Sunday, May 6, 2012 at 12:14am

statistics
The heights (in feet) of a sample of five randomly chosen students from School x are 6.3, 6.1, 5.7, 5.8, and 6.2. Determine a 90% confidence interval for the mean height of all students at School x
Sunday, May 6, 2012 at 12:12am

Statistics
For this assignment you are to imagine that you are part of a select marketing group. This select group has been asked to consider the Colorado City Convention and Visitors Bureau survey of 25 hotels in the local area. The survey is concerned with the current availability of ...
Saturday, May 5, 2012 at 8:19pm

statistics
The average electric bill in a residential area is $72 for the month of May. The standard deviation is $6. If the amounts of electric bills are normally distributed, find the probability that the mean of the bill for 15 residents will be less thatn $75
Saturday, May 5, 2012 at 9:29am

statistics
a set of maths exame score mean is 70 and variance is 8. a set of english score has mean is 74 and variance is 16. for which exame whould a score of x=78 have a higher standing?
Saturday, May 5, 2012 at 9:06am

statistics
The international olympic committe states that the female participation in the 2004 summer olympic games was 42%, even with new sports such as weight lifting, hammer throw, and modern pentathalon being added to the games. Broadcasting and clothing companies want to change ...
Friday, May 4, 2012 at 4:32pm

statistics
a coin is tossed 16 times. What is the standard deviation?
Thursday, May 3, 2012 at 11:32pm

Statistics
According to insurance records a car with a certain protection system will be recovered 89% of the time. Find the probability that 3 of 7 stolen cars will be recovered.
Thursday, May 3, 2012 at 8:43pm

statistics
The below table shows the probabilities generated by rolling one die 50 times and noting the up face. What is the probability of getting an odd up face? roll 1 Probability 0.22 roll2 probability 0.10 roll 3 probability 0.18 roll 4 probability 0.12 roll 5 probability 0.18 roll ...
Thursday, May 3, 2012 at 8:05pm

statistics
the life of light bulbs is distributed normally. The variance of the life time is 225 and the mean lifetime of a bulb is 590 hours. Find the probability of a bulb lasting for at most 603 hours. Yeah, WTF??? Why me!??!
Thursday, May 3, 2012 at 1:58pm

statistics
Suppose that a given population of trees have an average height of 10.2 ft and a standard deviation of 1.3 ft. Find the proportion of the population with heights above 11.8 ft.
Thursday, May 3, 2012 at 1:42pm

Statistics
The serum cholesterol levels in men aged 18 to 24 are normally distributed with a mean of 178.1 and a standard deviation of 40.7. A group of 9 men aged 18 to 24 randomly selected. 1. Find the probability that there are at least 2 men in the group whose serum cholesterol level ...
Thursday, May 3, 2012 at 11:10am

Statistics
Assume X~N(1.2, 1.3). Find P(0.26<|X|<1.68)?
Thursday, May 3, 2012 at 11:03am

Statistics
An insurance sales representative selects 4 policies to review. The group of policies she can select from contains 10 life policies, 5 automobile policies, and 3 homeowners policies. Find the probability of selecting all life policies. The number of ways to select all life ...
Thursday, May 3, 2012 at 9:07am

statistics
For 100 consecutive day frequencies of occurrence of the digits 35,35,30 for the digits 1,2,3 at .05, can you reject the hypothesis that the digits are from a uniform population?
Wednesday, May 2, 2012 at 7:58pm

statistics
when 325 students are randomly selected and surveyed, it is found that 117 own a car. Construct a 99% confidence interval estimate of the true proportion of all college students who own a car.
Wednesday, May 2, 2012 at 4:55pm

statistics
A committee consisting of 6 people is to be selected from eight parents and four teachers Find the probability of selecting three parents and three teachers?
Wednesday, May 2, 2012 at 4:25pm

Statistics
I've made an attempt to solve these using my TI-84 plus, however I don't know if my approach is correct. Any help is appreciated. 1.) As the costs of prescription drugs escalate, many senior citizens are ordering from or going to Canada to get their medicine. Is there ...
Tuesday, May 1, 2012 at 11:28pm

Psychology Statistics
What raw score marks the cut off score for the children in the 30th percentile (in the bottome 30%) in need of special assistance prior to attending school? Mean is 30.9, SD = 2.08, N= 20
Tuesday, May 1, 2012 at 2:54pm

statistics
: an airline offers discounted advanced purchase fares to customers who buy tickets more than 30 days before travel and charges regular fares for tickets purchased in the last 30 days before travel. The airline notices 60% of its customers take advantage of the advanced ...
Tuesday, May 1, 2012 at 12:14pm

statistics
a study is undertaken to determine the proportion of industry executives who believe that worker's pay should be based on individual performance. How many executives should be interviewed if an estimate is desired at the 99% confidence level to be withing .06? to be within...
Tuesday, May 1, 2012 at 4:34am

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