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March 4, 2015

Homework Help: Math: Statistics

Recent Homework Questions About Statistics

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statistics
Describe whether the following study would most likely be “observational” or “experimental”, and why it would be so. * Mystery shoppers monitor the preferences at a shopping mall It seems the obvious answer would be observational because, "mystery ...
Friday, February 6, 2015 at 8:03pm

Statistics
In a study of pleas and prison sentences, it is found that 40% of the subjects studied were sent to prison. Among those sent to prison, 20% chose to plead guilty. Among those not sent to prison, 10% chose to plead guilty. 3.3.a (0.5 pt) If a study subject is randomly selected...
Friday, February 6, 2015 at 4:18pm

statistics
A candidate for a political office claims that he will win the election. A poll is conducted, and 35 of 150 voters indicate that they will vote for the candidate, 100 voters indicate that they will vote for his opponent, and 15 voters are undecided. a. What is the population ...
Friday, February 6, 2015 at 3:31pm

Statistics HELP
There are two bags each containing red balls and yellow balls. Bag A contains 1 red and 4 yellow balls. Bag B contains 3 red and 13 yellow balls. Alva says that if we choose one bag and draw one ball from that bag you should always choose bag B if you are trying to draw a red ...
Friday, February 6, 2015 at 9:12am

Statistics
An experiment consists of tossing a fair coin twice. The student reasons that there are three possible outcomes: two heads, one head and one tail, or two tails. Thus,P(HH) 1/3
Friday, February 6, 2015 at 8:38am

statistics
the standard score for hours spent online at home for Minnesotans was 2.84. The mean equals 8.9 hours. Approximately how many hours do Minnesotan adults spend online at home.
Wednesday, February 4, 2015 at 5:46pm

Math, Statistics
I know its 1 - P(5/128) but I dont think its correct?? I flip a fair coin seven times in a row. What is the probability that I get at most five heads?
Wednesday, February 4, 2015 at 5:40pm

statistics
A company has four production sections viz., S1, S2, S3 and S4 which contribute 30%, 20%, 28% and 22% of the total output. It was observed that those sections respectively produced 1%, 2%, 3% and 4% defective units. If a unit is selected at random and found to be defective, ...
Wednesday, February 4, 2015 at 8:08am

statistics
Produce a 99.9 % confidence interval for the population mean body temperature of a healthy male. Then do the same for the population of healthy females. Round your answers to three decimal places.
Tuesday, February 3, 2015 at 9:45pm

Statistics
Pop. Mean =87 Standard deviation=8 Sample size=64
Monday, February 2, 2015 at 11:50pm

Criminal Justice/Judicial System
According to the Justice Department's Bureau of Justice Statistics, ________ of every 100 murder and nonnegligent manslaughter defendants are convicted. A. 17 B. 68 C. 46 D. 31 I think it's B., but not sure
Monday, February 2, 2015 at 8:03pm

statistics
A professor gave an aptitude test to a class of psychology students and computed the mean, median, and mode for the test scores. Which of the following statements cannot be an accurate description of the scores? -All of the above statements are false. -The majority of the ...
Sunday, February 1, 2015 at 12:48pm

Statistics
The height of a bluebird was measured in centimeters. If the ruler reads 10.599 centimeters, what is the lower real limit of the bluebird's height? I know the lower limits of 10 are 9.5 or 10.5 after we go further I don't understand how to get the rest of the real ...
Saturday, January 31, 2015 at 3:56pm

statistics
The following contingency of frequencies is based on a 5-year study of fire fatalities in Maryland. For purposes of clarity, columns and rows are identified by the letters A-C and D-G, respectively. Blood Alcohol Level of Victim A B C Age 0.00% 0.01-0.09% ¡Ý0.10% ...
Saturday, January 31, 2015 at 9:40am

Statistics
The following contingency of frequencies is based on a 5-year study of fire fatalities in Maryland. For purposes of clarity, columns and rows are identified by the letters A-C and D-G, respectively. Blood Alcohol Level of Victim A B C Age 0.00% 0.01-0.09% ¡Ý0.10% ...
Saturday, January 31, 2015 at 9:35am

Statistics Helps
Carter has a large marble collection. Carter knows that he has exactly 20 blue marbles in his collection, but does not know how many marbles he has in all. Carter mixes up his marbles and randomly selects 40 marbles. Of the 40 marbles that he chose, 4 were blue. How many ...
Thursday, January 29, 2015 at 10:43pm

statistics
my question is: So if the chance is 1 in 17,259,390 of winning, what is the expected value of the win? How would I do this problem. Hope you can help. Thank you
Wednesday, January 28, 2015 at 2:02pm

english
Common Sense Media's research report shows kids are reading less than ever. Discover the startling statistics -- and what you can do to get your kids back into books. Do you have a teen who hardly reads? You're not alone. Common Sense Media's latest research report...
Tuesday, January 27, 2015 at 12:27pm

Statistics
Find the to left of z=2.165. Please example how to find on chart
Monday, January 26, 2015 at 12:35am

psychlogical statistics
A random selection of files from a student counseling center revealed the following reasons why college students seek services: Mental health issues - 25 Learning/school issues - 15 Relationship issues - 5 Other - 5 What is the probability that if we pulled another student ...
Saturday, January 24, 2015 at 8:56pm

statistics
In a class of 300 students, John’s rank was 40. Find his percentile rank
Saturday, January 24, 2015 at 1:21pm

statistics
In throwing a pair of dice The event of getting a sum of 5 in the upturned faces of dice.
Saturday, January 24, 2015 at 6:44am

statistics help please
The employment percentages for men versus women in a computer company last year were 80% and 40%, respectively. At the beginning of this year, they had 150 men and 60 women currently hired. The owner of the company wishes to check their hiring practices and ensure that the ...
Friday, January 23, 2015 at 7:44pm

statistics
The employment percentages for men versus women in a computer company last year were 80% and 40%, respectively. At the beginning of this year, they had 150 men and 60 women currently hired. The owner of the company wishes to check their hiring practices and ensure that the ...
Friday, January 23, 2015 at 6:19pm

Statistics
Subtract to find the area to the right of z=1.23: 1-0.8907=?
Friday, January 23, 2015 at 4:26pm

Math (Statistics)
What causes experimental probability to match theoretical probability?
Friday, January 23, 2015 at 3:42pm

statistics
suppose a sample of 2404 tenth graders is drawn.Of the sampled, 601 read at or below the eighth grade level. using the data, construct the 98% confidence interval for the population proportion of tenth graders reading at or below the eighth grade level.
Friday, January 23, 2015 at 1:49pm

statistics
Suppose a large shipment of microwave ovens contained 18% defectives. If a sample of size 228 is selected, what isthe probability that the sample proportion will be greater than 14%? (Round your answer to 4 decimal places)
Friday, January 23, 2015 at 11:34am

Math (Statistics)
Hi! Can someone help me with these two questions? Thanks a bunch! :) 1.) What causes experimental probability to match theoretical probability? In theory heads and tails occur 50/50. 2.) Find a way to estimate the time to flip a coin 10,000 times; 100,000 times.
Friday, January 23, 2015 at 9:18am

statistics
I am trying to figure out how the answer of 0.989 came from the following equation of correlation. 7(-5)-(25)(13) _______________________ /7(127)-(25)*/x/7(71)-(13)*
Friday, January 23, 2015 at 6:46am

Math (Statistics)
Hi! Can someone help me with these two questions? Thanks a bunch! :) 1.) What causes experimental probability to match theoretical probability? In theory heads and tails occur 50/50. 2.) Find a way to estimate the time to flip a coin 10,000 times; 100,000 times.
Thursday, January 22, 2015 at 3:22pm

please answer statistics
Find warranty period (in days) for a washing machine whos average (mean) life is 6 years and standard deviation of 2.5 years. Assume 365 days in a year.
Thursday, January 22, 2015 at 2:26pm

statistics
Derive one Tail and Two Tail numbers for c = 0.88 or alpha = 0.12.
Thursday, January 22, 2015 at 2:22pm

STATISTICS(PLEASE READ)
Find warranty period (in days) for a washing machine whos average (mean) life is 6 years and standard deviation of 2.5 years. Assume 365 days in a year.
Thursday, January 22, 2015 at 2:06pm

statistics
The batting averages of the first three batters in the Eureka College women’s softball team lineup are .310, .301, and .277. If the first three batters are considered as the “lead-off group”, what is the batting average of the group?
Thursday, January 22, 2015 at 9:03am

statistics
The following is a list of 10 measurements: after adding and sub all 10 numbers I came up with a -29. Now it wants the sum 10/i,i than xi over 32. Do I x -29 and the 32 or do I divide. This is were I get very confused. I am sorry to ask again but I never taken statistic oh I ...
Wednesday, January 21, 2015 at 7:53pm

statistics
As part of a data base on new births at a hospital some variables recorded are the age of the mother, marital status of the mother (single, married, divorced), weight of the baby, and gender of the baby. Of these variables A. age, marital status, and weight are quantitative ...
Wednesday, January 21, 2015 at 6:53pm

statistics
A) Identify the question, population, and sample. b) Discuss any potential bias or lurking variables that may affect the results.? c) Write about the extent to which we can generalize the findings to all people who use cell phones. Stewart Fist reported the results of an ...
Wednesday, January 21, 2015 at 2:12pm

Statistics
A) Identify the question, population, and sample. b) Discuss any potential bias or lurking variables that may affect the results.? c) Write about the extent to which we can generalize the findings to all people who use cell phones. Stewart Fist reported the results of an ...
Wednesday, January 21, 2015 at 11:18am

statistics
A) Identify the question, population, and sample. b) Discuss any potential bias or lurking variables that may affect the results.? c) Write about the extent to which we can generalize the findings to all people who use cell phones. Stewart Fist reported the results of an ...
Wednesday, January 21, 2015 at 8:15am

statistics(please answer!)
Derive one Tail and Two Tail numbers for c = 0.88 or alpha = 0.12.
Tuesday, January 20, 2015 at 8:56pm

statistics(please answer!)
find P( t > 5) for DF =2.
Tuesday, January 20, 2015 at 8:38pm

statistics(please answer!)
find a t score (a) such that P( -a < t < a) = 0.95. Asume sample size n = 10.
Tuesday, January 20, 2015 at 8:26pm

statistics(please answer!)
Find a t score (a) such that P( -a < t < a) = 0.95. Asume sample size n = 10.
Tuesday, January 20, 2015 at 8:16pm

statistics(please answer!)
What is the chance of getting 50/% correct on a test with 20 questions, each question is either True or False. Assume you are blindly guessing and answer all questions
Tuesday, January 20, 2015 at 4:11pm

Statistics (Please Please Answer!)
i bought a vegetable seed pocket containing 20 seeds. A manufacturer label on the pocket said that the seeds have at least 90% germination rate. I planted all 20 seeds following their instructions in preparing soil and water. They told me if an "unlikely event" ...
Tuesday, January 20, 2015 at 3:59pm

statistics(please answer!)
i bought a vegetable seed pocket containing 20 seeds. A manufacturer label on the pocket said that the seeds have at least 90% germination rate. I planted all 20 seeds following their instructions in preparing soil and water. They told me if an "unlikely event" ...
Tuesday, January 20, 2015 at 3:13pm

Psychology Statistics
Submit your answers to the following questions using the ANOVA source table below. The table depicts a two-way ANOVA in which gender has two groups (male and female), marital status has three groups (married, single never married, divorced), and the means refer to happiness ...
Tuesday, January 20, 2015 at 2:53pm

statistics
i bought a vegetable seed pocket containing 20 seeds. A manufacturer label on the pocket said that the seeds have at least 90% germination rate. I planted all 20 seeds following their instructions in preparing soil and water. They told me if an "unlikely event" ...
Tuesday, January 20, 2015 at 2:00pm

statistics
Post a null hypothesis that would use a t test statistical analysis.. Use the same hypothetical situation taken in the t test hypothesis, and turn it into a null hypothesis using a one-way ANOVA analysis and a two-way ANOVA.
Tuesday, January 20, 2015 at 12:42pm

statistics
What is the chance of getting 50/% correct on a test with 20 questions, each question is either True or False. Assume you are blindly guessing and answer all questions
Monday, January 19, 2015 at 7:43pm

statistics
Would it be appropriate to use a random number table to select a digit for each blank square in sudoku
Monday, January 19, 2015 at 6:34pm

statistics
The 2003 Statistical Abstract of the United States reported the percentage of people 18 years of age and older who smoke. Suppose that a study designed to collect new data on smokers and nonsmokers uses a preliminary estimate of the proportion who smoke of .32. a. How large a ...
Sunday, January 18, 2015 at 1:40pm

Statistics
A survey or college students collected information on several variables: distance from home, age, major, gender, and class. The variable major is A) neither categorical nor numerical B) categorical C) quantitative Please help :)
Sunday, January 18, 2015 at 12:47am

Statistics
When ordering vinyl replacement windows, the following variables are specified for each window. Which of these variables is quantitative? A) window style- double hung, casement, or awning B) window style- single pane or double pane C) area of the window opening in square inches
Sunday, January 18, 2015 at 12:25am

Statistics
An instructor asked students to name their favorite color. An appropriate graph to display the data is a... A) histogram B) pie chart C) time plot
Sunday, January 18, 2015 at 12:23am

math
• what is statistics • Perspective statistics • inferential statistics • Data statistics • Example of a Quantitative data • Example of a Qualitative data • What is population •what are the different scale of measurement • what are ...
Saturday, January 17, 2015 at 9:08pm

law
where can I find statistics crime rates in missouri
Saturday, January 17, 2015 at 6:30pm

statistics
In a class of 100 students, 30 are computer science majors, 49 are mechaincal engineering majors, 13 are civil engineers and the rest are general engineering majors. Assume students only have one major. If a student is chosen at random what is the probability they are: a civil...
Friday, January 16, 2015 at 9:23pm

statistics
Use the given information to find the minimum sample size required to estimate an unknown population mean μ. How many commuters must be randomly selected to estimate the mean driving time of Chicago commuters? We want 99% confidence that the sample mean is within 4 ...
Friday, January 16, 2015 at 6:05pm

statistics
a statistics instructor collected data on the time it takes the students to complete a test. the test taking time is uniformly distributed within a range of 35 minutes to 55 minutes. determine the standard deviation, what is the probability a particular student will take less ...
Tuesday, January 13, 2015 at 10:51pm

statistics
Statistics students were asked to go home and fill a 1-cup measure with raisin bran and to tap the cup gently on the counter 3 times to settle the contents. Then, if necessary, add more raisin bran to bring the contents exactly up to the 1-cup line. Once at the 1-cup line, the...
Tuesday, January 13, 2015 at 6:39pm

statistics
The lifetimes of light bulbs of a particular type are normally distributed with a mean of 370 hours and a standard deviation of 5 hours. What percentage of bulbs has lifetimes that lie within 1 standard deviation of the mean on either side?
Monday, January 12, 2015 at 7:55pm

Statistics
If light bulbs have lives that are normally distributed with a mean of 2500 hours and a standard deviation of 500 hours, what percentage of light bulbs have a life less than 2500 hours
Monday, January 12, 2015 at 7:53pm

statistics
Can you explain how to do this problem The following is a list of 11 measurements: 72, 28, 56, -47, -36, -41, 21, -31, -56, 41, -54 . Suppose that these 11 measurements are respectively labeled x1, x2,...x11 . (Thus,72 is labeled x1 ,28 is labeled x2 and so on.) Find 11 looks ...
Monday, January 12, 2015 at 6:00pm

Statistics
Can someone help me with this question. I am so very confused. Find the y-intercept of the line whose equation is y=0.7x +6.2. could the answer be 5
Monday, January 12, 2015 at 2:26pm

Statistics
Did you ever buy an incandescent light bulb that failed (either burned out or did not work) the first time you turned the switch on? When you put a new light bulb into a light fixture, you expect it to light and most of the time it does. Consider 8-packs of 60-watt bulbs and ...
Monday, January 12, 2015 at 1:24pm

Statistics
The image of the public library is constantly changing, and their online services continue to grow. Usage of the library's home page grew by 17% during the past 12 months. It has been estimated that the current average length of a visit to the library's home pages is ...
Monday, January 12, 2015 at 1:16pm

Statistics
A company that produces rivets used by commercial aircraft manufactures knows that the shearing strength (force required to breaking) of its rivets is a major concern. The company believes the shearing strength of its rivets is normally distributed with a mean of 925 lbs and a...
Monday, January 12, 2015 at 1:12pm

statistics
One of nature's patterns connects the percent of adult birds in a colony that return from the previous year and the number of new adults that join the colony. Following are data for 13 colonies of sparrowhawks: Percent return 73 61 79 54 75 62 53 46 57 50 62 45 35 New ...
Sunday, January 11, 2015 at 9:33am

College Algebra
According to data from the National Vital Statistics Report, the marriage rate (marriages per 1000) can be described by y=-0.146x+11.074, where x is the number of years after 1980. For what years does this model indicate that the marriage rate was above 9 marriages per 1000? ...
Thursday, January 8, 2015 at 1:27am

Psychological Statistics
For a population with a mean of 80 and a standard deviation of 12, what is the Z score corresponding to an individual score of 92
Wednesday, January 7, 2015 at 6:17pm

Vocabulary Studies
Building and construction A. Architecture B. Engineering C. Nursing D. Statistics I think it might be A?
Tuesday, January 6, 2015 at 12:18pm

Statistics
Evaluate the following. 20 divide 5+8+2x4 Thank you
Monday, January 5, 2015 at 9:48pm

Statistics
The records of a computer retail store show that out of the 100 customers who purchased a desktop computer last month, 69 also purchased a service plan that extends the warranty for an extra year. Out of the 25 customers who purchased a notebook computer last month, 20 ...
Monday, January 5, 2015 at 7:15pm

Statistics
If someone could help with this problem so I can understand how to perform the actions. In the past year, Carmen watched 51 movies that she thought were very good. She watched 60 movies over the whole year. Of the movies she watched, what percentage did she think were very ...
Monday, January 5, 2015 at 3:20pm

Statistics
[(15-8)x3-13]divide 2
Monday, January 5, 2015 at 1:01pm

probability and statistics
a certain university in the region has a population of 20000 students distributed into 15 courses and four year levels.if you would like to determine the sample size, what technique can be applied
Sunday, January 4, 2015 at 3:45am

Statistics
A filing machine designed to fill soda bottles with 16 ouncesof soda. The distribution for the weight of the bottles is normal. Twenty bottles are selected and weighted. The sample mean is 15.3 ounces and the standard deviation is 1.5 ounces . Develop a 90% confidence interval...
Saturday, January 3, 2015 at 4:27am

Statistics
There are 300 students enrolled in Business Statics . Historically,exam scores are normally distributedwith a standard deviation of 30.9. Your instructor randomly selected a sample of 30 examinations and finds a mean of 74.2. Determine a 90% confidence interval for the mean ...
Saturday, January 3, 2015 at 4:16am

Statistics
A firm claims that only 10% of it's accounts receivables are over 30 days past due. The bank that supplies working capital or interim laons to the fimrs is suspect of the figure and accordingly takes a random samole of 100 accounts of the firm. Find the probability that ...
Saturday, January 3, 2015 at 3:57am

Statistics
The age of customers for a particular retail store follows a normal distribution with a mean of 37.5 years and a standard deviation of7.6 years.What is the probability that the next customer who enters the store will be less than 42 years old?
Saturday, January 3, 2015 at 3:28am

Statistics
In 2000,the average charge of tax preparation was $95.Assuming a normal distibution and standard deviation of $10.What proportion of tax preparation fees were more than $95?
Saturday, January 3, 2015 at 3:20am

Math/ Statistics
The owner of a football team claims that the average attendance at home games is over 3000, and he is therefore justified in moving the team to a city with a larger stadium. Assuming that a hypothesis test of the claim has been conducted and that the conclusion is failure to ...
Tuesday, December 30, 2014 at 12:17pm

Math/ Statistics
A consumer advocacy group claims that the mean amount of juice in a 16 ounce bottled drink is not 16 ounces, as stated by the bottler. Determine the null and alternative hypotheses for the test described. A. H0: µ = 16 ounces Ha: µ < 16 ounces B. H0: µ &...
Tuesday, December 30, 2014 at 12:09pm

Math/ Statistics
z = 1.8 for Ha: µ > claimed value. What is the P-value for the test?   A. 0.9641 B. 3.59 C. 96.41 D. 0.0359
Tuesday, December 30, 2014 at 12:06pm

math
Describe a situation this week when you used math to solve a problem involving data, graphs and statistics.
Monday, December 29, 2014 at 10:41am

statistics
There were 50 men and 50 women who were randomly selected from a larger population. •A t-test was conducted to compare men and women’s performance on an assessment after eating chocolate. The results showed an independent t-test value of t .05(99) = 3.43; p < ....
Monday, December 29, 2014 at 1:25am

statistics
A jar contains 7 red balls, 5 green balls, 4 blue balls, and 3 white balls. A sample of size 7 balls is selected at random without replacement . Find t the probability that sample contains two red balls, 2 green balls, 2 blue balls, and 1 white ball.
Friday, December 26, 2014 at 5:23am

statistics
interested in the mean IQ score of a given group of children. It is known that the IQ scores of the group have a standard deviation of . The psychologist randomly selects children from this group and finds that their mean IQ score is . Based on this sample, find a confidence ...
Sunday, December 21, 2014 at 4:19pm

statistics
Write a correct alternative hypothesis for the claim that the average professional basketball player is at least 6’ 9” tall.
Friday, December 19, 2014 at 11:54am

statistics
An IQ test was administered to a random sample of 26 mental patients and the mean was found to be 99.7. For this test, the population values are known to be normally distributed and with a population standard deviation of 15. Construct a 90% confidence interval for the mean IQ...
Thursday, December 18, 2014 at 6:16pm

statistics
find the area under the curve y=3log1.2x between x = 1.2 and x = 3
Thursday, December 18, 2014 at 5:46am

Statistics
What is the difference between normal distribution and approximate normally. Correct me if im wrong but I think the parameters of Normal is X~Normal (mu, standard deviation) but then approx. normal is X~Normal (mu, variation) im just really confused when you use each and such.
Thursday, December 18, 2014 at 5:37am

Statistics
In the past, the mean running time for a certain type of flashlight battery has been 8.0 hours. The manufacturer has introduced a change in the production method and wants to perform a hypothesis test to determine whether the mean running time has increased as a result. The ...
Wednesday, December 17, 2014 at 8:15am

statistics HELP!
A data set includes body temperatures of healthy adult humans for which 98.1F and s= 0.56F. What is the best point estimate of the mean body temperature of all healthy humans? Using the sample statistics, construct a confidence interval estimate of the mean body temperature of...
Tuesday, December 16, 2014 at 6:53pm

Statistics
Consumption of alcoholic beverages by young women of drinking age has been increasing in the United Kingdom, the United States, and Europe (The Wall Street Journal, February 15, 2006). Data (annual consumption in liters) consistent with the findings reported in The Wall Street...
Tuesday, December 16, 2014 at 2:37am

statistics
There are three brands of milk for sale in a supermarket. Let's call them brand A, B, and C. A customer who purchases milk will choose brands A,B, and C with probability 0.6, 0.3, 0.1, respectively. Each day, the toal number of customers who purchase milk at this market ...
Sunday, December 14, 2014 at 1:15am

statistics
In a test of the effectiveness of garlic for lowering cholesterol, 47 subjects were treated with garlic in a processed tablet form. Cholesterol levels were measured before and after the treatment. The changes in their levels of LDL cholesterol (in mg/dL) have a mean of 3.8 and...
Saturday, December 13, 2014 at 2:40pm

statistics
A survey found that women's heights are normally distributed with mean 63.5 in. and standard deviation 2.3 in. The survey also found that men's heights are normally distributed with a mean 68.7 in. and a standard deviation 2.8. (a) Most of the live characters at an ...
Saturday, December 13, 2014 at 10:05am

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