Sunday
May 19, 2013

# Homework Help: Math: Statistics

statistics
If a large number of people guess randomly on each of 100 items on a true-false test, the mean would be expected to be ì=___*, and ó=__*. • What % of the examinees would be expected to get a score of 65 or >?
Tuesday, October 4, 2011 at 6:12pm

statistics
Suppose that the population standard deviation (ó) for a normally distributed standardized achievement test (ACT) is 6. What would the standard error of the sample mean (óxbar) be if we were to draw a random sample of 36 test scores?
Tuesday, October 4, 2011 at 3:53pm

probability and statistics
(Right Triangle Problem) Randomly cut a line segment into three pieces. What is the probability that these three pieces can form a right triangle?
Tuesday, October 4, 2011 at 9:25am

statistics
(Blood Test Problem) Suppose 100 people are waiting for blood test for a kind of disease. The probability that for one person the test result is positive equals 0.1. Two test methods are as follows: Method 1: Test one by one. Then we have to do 100 tests. Method 2: Divide 100...
Tuesday, October 4, 2011 at 9:23am

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?
Monday, October 3, 2011 at 6:12pm

statistics
what is the probability of randomly selecting a student who exercises between 55 and 80 minutes per week?
Monday, October 3, 2011 at 1:33pm

statistics
According to the National Transportation Safety Board, 10% of all major automobile crashes result in serious injury to at least one person involved in the crash. The Georgia Department of Transportation reports that there are approximately 20 major automobile crashes per month...
Monday, October 3, 2011 at 11:28am

statistics
There are approximately 27 class days for Applied Statistics this semester. If you miss 3 classes, approximately what percent of the course have you missed?
Monday, October 3, 2011 at 7:55am

Statistics
A bag contains two blue, three purple, four yellow, two red, three green and one orange marbles. What is the conditional probability that, without replacement, the second marble is purple given that the first marble is green?
Sunday, October 2, 2011 at 9:32pm

Statistics
A bag contains two blue, three purple, four yellow, two red, three green and one orange marbles. What is the conditional probability that, without replacement, the second marble is purple given that the first marble is green?
Sunday, October 2, 2011 at 9:31pm

statistics
The following data on the number of iron workers in the United States for the years 1978 through 2008 are provided by the U.S. Bureau of Labor Statistics. Using regression techniques discussed in this section, analyze the data for trend. Develop a scatter plot of the data and ...
Sunday, October 2, 2011 at 9:12pm

statistics
The following data on the number of iron workers in the United States for the years 1978 through 2008 are provided by the U.S. Bureau of Labor Statistics. Using regression techniques discussed in this section, analyze the data for trend. Develop a scatter plot of the data and ...
Sunday, October 2, 2011 at 8:58pm

statistics
Consider a hypothetical population of dogs in which there are four possible weights, all of which are equally likely: 42, 48, 52, or 58 pounds. If a sample of size n=2 is drawn from this population, what is the sampling distribution of the total weight of the two dogs selected...
Sunday, October 2, 2011 at 7:24pm

statistics
According to the National Transportation Safety Board, 10% of all major automobile crashes result in serious injury to at least one person involved in the crash. The Georgia Department of Transportation reports that there are approximately 20 major automobile crashes per month...
Sunday, October 2, 2011 at 5:20pm

statistics
The following gives the height of 100 men in centimeters. 153 162 168 154 151 168 162 153 161 167 157 154 165 156 163 165 160 171 170 173 164 158 163 155 167 162 168 153 161 166 163 162 163 163 163 164 165 163 162 162 163 161 162 162 158 162 167 158 169 168 168 156 160 158 169...
Sunday, October 2, 2011 at 5:11pm

math( statistics)
How many simple random samples, SRS's, are possible of size 40 from a population of size 5000? (express in scientific notation 4 sign. figures) * I'm not sure how to start off.
Sunday, October 2, 2011 at 4:51pm

statistics
samples of size n=900 are randomly selected from the population of numbers (0 through 9) produced by a random-number generator, and the proportion of numbers greater than 5 is found for each sample. what is the shape distribution of the sample proportions
Sunday, October 2, 2011 at 10:59am

Statistics
Please help me. I am working a paper that needs a verbal statment and a numerical statement. My hypthoesis is The use of social media Facebook is associated with an increase among couples.. if anyone can help that would be great. Thanks so much.
Sunday, October 2, 2011 at 8:41am

statistics
b. What is the probability that, in 20 major crashes, between three and seven result in serious injury?
Saturday, October 1, 2011 at 6:03pm

statistics
A quality-control program at a plastic bottle production line involves inspecting finished bottles for flaws such as microscopic holes. The proportion of bottles that actually have such a flaw is only 0.0002. If a bottle has a flaw, the probability is 0.995 that it will fail ...
Saturday, October 1, 2011 at 4:49pm

Statistics
For a distribution in which the mean is 100 and the standard deviation is 12, find the following: the percentile of a score of 106. How do I do this, I am completely lost.
Saturday, October 1, 2011 at 3:52pm

statistics
A manager states that in his factory, the mean number of days per year missed by his employees is less than the national mean of 10. The following data is days missed by some of his employees last year (mean=5.025, standard deviation=3.634). Is there sufficient avidence to ...
Saturday, October 1, 2011 at 10:53am

statistics
At a certain college, there were 400 science majors, 100 engineering majors, and 600 business majors. If one student was selected at random, the probbility that they are an engineering major is
Saturday, October 1, 2011 at 10:47am

Statistics
John drives to work each morning and the trip takes an average of m = 38 minutes. The distribution of driving times is approximately normal with a standard deviation of s = 5 minutes. For a randomly selected morning, what is the probability that John's drive to work will ...
Saturday, October 1, 2011 at 3:41am

statistics
For a distribution in which the mean is 100 and the standard deviation is 12, find the following: the percentile of a score of 106.
Friday, September 30, 2011 at 11:57pm

statistics
Suppose that the number of accidents occurring in an industrial plant is described by a Poisson process with an average of 1.5 accidents every three months. During the last three months, four accidents occurred. (a)probability that no more than 12 accidents will occur during a...
Friday, September 30, 2011 at 7:12pm

statistics
A retail store has implemented procedures aimed at reducing the number of bad checks cashed by its cashiers. The store's goal is to cash no more than eight bad checks per week. The average number of bad checks cashed is 3 per week. Let x denote the number of bad checks ...
Friday, September 30, 2011 at 7:02pm

statistics
A state has averaged one small business failure per week over the past several years. Let x denote the number of small business failures in the next eight weeks. Use the Poisson distribution to find P(x ¡Ý 17) if the mean number of small business failures remains ...
Friday, September 30, 2011 at 6:58pm

statistics
A scale measuring prejudice has been administered to a large sample of respondents. The distribution of scores is approximately normal with a mean of 31 and a standard deviation of 5. What percentage of sample had scores 1) Below 20 2) Above 40 3) Above 20 4) Below 40 5) Below...
Friday, September 30, 2011 at 5:04pm

statistics
A telephone company's goal is to have no more than five monthly line failures on any 150 miles of line. The company currently experiences an average of 3 monthly line failures per 75 miles of line. Let x denote the number of monthly line failures per 150 miles of line. ...
Friday, September 30, 2011 at 2:41pm

Statistics
sara is a healthy baby who was exclusively breast-fed for her first 12 months. what is more likely a description of her weights (at 3, 6, 9, and 12 months of age) as percentiles.
Friday, September 30, 2011 at 1:47pm

statistics
The distribution score for a city wide math test scores results in a mean of 70 and a standard deviation of 12. What score is 2 standard deviations above the mean?
Friday, September 30, 2011 at 11:07am

statistics
is it unusual for the mean of a sample 3 to 115 or more?
Friday, September 30, 2011 at 7:22am

Statistics
A random sample of size 36 is to be selected from a population that has a mean μ = 50 and a standard deviation σ of 10. - - Find the mean of this sampling distribution. - Find the standard error of this sampling distribution.
Friday, September 30, 2011 at 7:21am

statistics
The credit card industry has determined that about 65% of college student ls will be late making a minimum payment when paying their credit card every year atleast once. If 10 randomly selected students who own a credit card is selected what is the mean and standard deviation ...
Friday, September 30, 2011 at 3:29am

Statistics
9 trucks arrive per hour. It takes 6 minutes after reaching the loading station. Two alternatives to modify the situation. One is to change the trucks and add a helper at the loading station at a cost of 50,0000. This would change the arrival time of the trucks to 6 per hour ...
Thursday, September 29, 2011 at 11:41pm

statistics
A normal distribution has a mean of 20 and a standard deviation of 2. If you convert every score in the distribution to Z scores, which of the following statements would be true of the resulting distribution?
Thursday, September 29, 2011 at 7:13pm

statistics
A job in an insurance office involves telephone conversations with policyholders. The office manager estimates that about half of the employee’s time is spent on the telephone. How many observations are needed in a work sampling study to estimate that time percentage to ...
Thursday, September 29, 2011 at 6:54pm

statistics
AB ia a uniform rod of length 120 cm and weight 18kg.wt it rotates about a hinge at its end A. its end B is pulled by a light string whose other end is tied to point C over A. the rod is in equilibrium when it inclines to the horizontal at 30degree if the reaction of the hinge...
Thursday, September 29, 2011 at 6:35am

early childhood education
1)according to the national center for education statistics which of th following is a false statement a)when it comes to grade and homework boys outperform girls in elementary secondary high school college and even graduate school. b)boys are more likely than girls to be ...
Wednesday, September 28, 2011 at 8:19pm

statistics
The data below are the final exam scores of 10 randomly selected statistics students and the number of hours they studied for the exam. Calculate the correlation coefficient r.
Wednesday, September 28, 2011 at 6:05pm

statistics
1) A scale measuring prejudice has been administered to a large sample of respondents. The distribution of scores is approximately normal with a mean of 31 and a standard deviation of 5. What percentage of sample had scores below 20?
Tuesday, September 27, 2011 at 10:29pm

statistics
True or false> in a physics class there are 9 juniors and 21 males. Then there must be 30 male juniors in this class.
Tuesday, September 27, 2011 at 12:18pm

statistics
if there are 12 likely events, the the probability of the first one occuring is 1/12> True or false
Tuesday, September 27, 2011 at 12:17pm

statistics
at a certain college, there were 700 science majors,100 engineering majors and 500 business majors. if one student was selected at random, the probability that they are an engineering major is?
Tuesday, September 27, 2011 at 12:15pm

statistics
according to a survey of men interviewed 20% had asked for a raise and 59% of the man who asked for a raise received the raise if a man is selected from the survey population of men fine the folowing proability P(man asked for raise and received raise)
Tuesday, September 27, 2011 at 11:54am

statistics
M=76 then what is the z-score for the sample mean?
Tuesday, September 27, 2011 at 10:49am

statistics
for a distribution standard deviation=10.If every item is increased by 2 then what will new standard deviation?
Tuesday, September 27, 2011 at 10:09am

statistics
for a distribution standard deviation=10.If every item is increased by 2 then what will new standard deviation?
Tuesday, September 27, 2011 at 10:07am

statistics
1. On final examination in Business Law, the mean was 68 and the standard deviation was 12. Determine the standard scores of students receiving marks of 50?
Tuesday, September 27, 2011 at 7:24am

Statistics
the mean age for 12 students in a math class is 20. 2 older students, age 32 and36, respectively enroll. what is the new mean age for the class?
Tuesday, September 27, 2011 at 2:25am

statistics
In order to study whether IQ level is related to birth order, data were collected from a sample of 540 students on their birth order (Oldest/In Between/Youngest) and their score on an IQ test. The data collected in this study would be best displayed using: which one: (a) a pie...
Monday, September 26, 2011 at 10:30pm

statistics
what is the z-score for a sample that has a sample mean of 6 based on a sample of 36 a population mean of 4 and a population std deviation of 3
Monday, September 26, 2011 at 8:02pm

statistics
Assume that a population is normally distributed with a mean of 100 and a standard deviation of 15.
Monday, September 26, 2011 at 10:30am

Statistics
Recall that very satisfied customers give the XYZ- Box video game system a rating that is at least 42. Suppose that the manufacturer of the XYZ- Box wishes to use the random sample of 65 satisfaction ratings to provide evidence supporting the claim that the mean composite ...
Monday, September 26, 2011 at 9:08am

Statistics
Determine the regression line of x+2y-5=0 and 3x+3y-8=0 (i) y on x and (ii) x on y, (iii) Find r using the regression coefficients
Monday, September 26, 2011 at 8:43am

statistics
Maurice has been recording the price of fuel at a local gas station throughout the week. His data is shown below. Day Price (per gallon) Monday \$2.71 Tuesday \$2.77 Wednesday \$2.86 Thursday \$2.80 Friday \$2.75 To the nearest percent, what is the percent change in the gas price ...
Monday, September 26, 2011 at 12:52am

statistics
draw a negatively skewed result
Sunday, September 25, 2011 at 10:04pm

statistics
For a population with µ = 70 and ó = 20, find the z-score that corresponds to each of the following X-values
Sunday, September 25, 2011 at 6:52pm

statistics
If 86% of households have cable television and three households are picked at random, what is the probability that at least one of those three picked will have cable television?
Sunday, September 25, 2011 at 6:25pm

statistics
Will the sampling distribution of means be approximately normal if n=25 or so, even if the frequency distribution of X values is not normal?
Sunday, September 25, 2011 at 4:55pm

statistics
If there are 24 students in a class, how many different-sized groups can be formed, and how many students will be in each group? Make a list of all possible groupings.
Sunday, September 25, 2011 at 3:14pm

statistics
what sampling technique is used if a quality-control inspector selected every 20th DVD player as it came off an assembly line
Sunday, September 25, 2011 at 1:10pm

Statistics
You have available five different investment strategies and their respective payoffs for various states-of-nature as shown in the chart below. Which investment would you make under the different decision criteria? States of Nature Sever Decline Moderate Decline Stable Moderate...
Sunday, September 25, 2011 at 12:22pm

statistics
A small company has 15 employees. Five of these employees will be selected randomly to be interviewed as part of an employee satisfaction program. How many different groups of five can be selected?
Sunday, September 25, 2011 at 12:23am

Statistics
Normal probabilities. 11% of all observations are less than z
Saturday, September 24, 2011 at 10:59pm

statistics
Six students from a statistic class reported the number of hours of television they watched per week. Here are their data: 8,10,5,14,3,6. What is the median number of hours of television watched per week for this sample of 6 students
Saturday, September 24, 2011 at 10:25pm

statistics
Suppose you are commparing frequency date for two groups,25 managers and 150 blue collar workers.Why would a relative frequency distribution be better than a frequency distribution?
Saturday, September 24, 2011 at 6:29pm

statistics
12.27 A study has been carried out to compare the United Way contributions made by clerical workers from three local corporations. A sample of clerical workers has been randomly selected from each firm, and the dollar amounts of their contributions are as follows. (Use data ...
Saturday, September 24, 2011 at 6:29pm

statistics
What is the probability a student answer at least 4 out of five questions correctly on a quiz? n=15, x>=4, p=.20, q=.80
Saturday, September 24, 2011 at 4:55pm

Statistics
Jan Gentry is the owner of a small company that pro¬duces electric scissors used to cut fabric. The annual demand is for 9,000 scissors and Jan produces the scissors in batches. On average, Jan can produce 185 scissors per day. Demand for scissors has been about 45 scis&...
Saturday, September 24, 2011 at 2:17pm

statistics
You have available five different investment strategies and their respective payoffs for various states-of-nature as shown in the chart below. Which investment would you make under the different decision criteria? States of Nature Sever Decline Moderate Decline Stable Moderate...
Saturday, September 24, 2011 at 2:14pm

MATH
Can someone please HELP me figure this out? According to statistics gathered as part of a research project by a group of statistics students on the college campus, 376 out of the 439 deaths attributed to lightning strikes were male. If all of the names of the deceased were ...
Saturday, September 24, 2011 at 11:29am

statistics
The Ace AirLines has a policy of overbooking flights. The random variable x represents the number of passengers who cannot be boarded because there were more passengers that seats. x P(x) 0 0.061 1 0.132 2 0.255 3 0.345 4 0.207 a)Is this a probability distribution? How do you ...
Friday, September 23, 2011 at 11:43pm

Statistics
statistics (mean, median, mode): X=3 and the first score is 2 points above and the second score is 4 points above how many points below is the third?
Friday, September 23, 2011 at 11:11am

statistics
CALCULATE THE MEAN DEVIATION FROM 1)THE MEAN,THE MEDIAN OF THE FOLLOWING SET OF EXAM MAQRKS ,45,32,37,46,50,60,70,0,84
Friday, September 23, 2011 at 2:16am

critical thinking
Please check my work. I have no one here to help thank you. 9. Explain what techniques you would use to present your ideas on this topic and persuade others effectively. If I were to represent any ideas in the argument, I would consider using persuasiveness consistently. I ...
Thursday, September 22, 2011 at 10:36pm

statistics
A basic statistics course had a total of 25 students which included 15 female (F) students whose distribution by major was 4 in Bio (B), 6 in COM (C), 3 in ECO (E), and 2 in PSY (P). In addition, the course had 10 male (M) students whose distribution by major was 2 in BIO (B...
Thursday, September 22, 2011 at 6:51pm

statistics
If the mean of a set of data is 21.00, and 6.00 has a z score of –1.50, then the standard deviation must be
Thursday, September 22, 2011 at 6:05pm

Math Help
According to statistics gathered as part of a research project by a group of statistics students on the college campus, 376 out of the 439 deaths attributed to lightning strikes were male. If all of the names of the deceased were placed into a drum and one (1) name was ...
Thursday, September 22, 2011 at 8:22am

statistics
Each of 25 adult women was asked to provide her own height (y), in inches, and the height of her father. The scatterplot below displays the results. Only 22 of the 25 pairs are distinguishable because some of the (x, y) pairs were the same. The equation of the least square ...
Thursday, September 22, 2011 at 12:19am

statistics
The scores on the final exam in a course have approximately a bell-shaped distribution. The mean score was 72, the highest score was 99, and the lowest score was 41. Use the value of the range (58) to estimate the value of the standard deviation. (Round your answer to the ...
Wednesday, September 21, 2011 at 6:46pm

Statistics
Find the numerical value of k: -2.35=[(k-100)/15]
Wednesday, September 21, 2011 at 3:30pm

Statistics
An automatic machine in a manufacturing process is operating properly if the lengths of an important subcomponent are independently and normally distributed with a mean of 120 cm and a standard deviation of 4.7 cm. Find the probability that if 3 are randomly selected, all 3 ...
Wednesday, September 21, 2011 at 3:02pm

Statistics
A population has u=100 σ=20. If you select a single score from this population, on the average, how close would it be to the population mean? Explain your answer
Wednesday, September 21, 2011 at 12:12pm

financial statistics
Can you construct a pair of random variables such that Var(X)=Var(Y)=1 and Cov(X,Y)=2?
Wednesday, September 21, 2011 at 11:42am

statistics
Miles per gallon. In its Fuel Economy Guide for 2008 model vehicles, the Environmental Protection Agency gives data on 1152 vehicles. There are a number of outliers, mainly vehicles with very poor gas mileage. If we ignore the outliers, however, the combined city and highway ...
Wednesday, September 21, 2011 at 12:04am

statistics
# A stoplight at the corner of Lincolnway and Duff Avenue is red 20% of the time. For someone who drives through this stoplight 10 times a week, what is the probability that they will stop at least three times? a: .201 b: .771 c: .878 d: .322
Tuesday, September 20, 2011 at 10:46am

statistics
For an ungrouped data set with an odd number of observations that have been sorted or arrayed from smallest to largest values, where is the median located?
Monday, September 19, 2011 at 9:27pm

statistics
i have 95 beads. 20 more red than blue.two times as manywhite beads than red beads. how many blue beads do i have?
Monday, September 19, 2011 at 8:17pm

statistics
once again I am not getting this. assume that the population of heights of male college students is normally distibuted with a mean of 69.09 and standard deviation of 4.71. A random sample of 92 heights is obtained. find the mean and standard error of the x distribution. find ...
Monday, September 19, 2011 at 7:40pm

statistics
given the following population data, x=17,13,23,15,19,19,21,28 calculate the z score value for a score of 18.
Monday, September 19, 2011 at 7:21pm

statistics
Suppose that is normally distributed with mean 90 and standard deviation 12. What value of does only the top 20% exceed?
Monday, September 19, 2011 at 5:37pm

statistics
the authors's generac generator produces voltage amounts with a mean of 125.0 volts and a standard deviation of 0.3 volts, and the voltages have a bell-shaped distribution. using the empiral rule, what is the percentage of voltage amounts between 124.4 and 125.6 volts? ...
Monday, September 19, 2011 at 2:00pm

statistics
compute the percentile rank of the raw score 8 in the following distribution 8,5,6,9,3,5
Monday, September 19, 2011 at 7:37am

statistics
1. Use the following information about a group of college students: Fifty percent are taking Algebra. Sixty percent are taking Biology. Thirty percent are taking both Biology and Algebra. A student from the group is selected at random, calculate the following: a) The ...
Sunday, September 18, 2011 at 11:58pm

statistics
In a certain college, 55% of the students are women. Suppose, we take a sample of two students. Use a probability tree to find the probability that at least one of the two students is a woman.
Sunday, September 18, 2011 at 10:18pm

statistics
. In a sample of n = 6, five individuals all have scores of X = 10 and the sixth person has a score of X = 16. What is the mean for this sample?
Sunday, September 18, 2011 at 10:06pm

statistics
Bob is a salesman. He receives \$20 for each sales plus a fixed salary of \$100 per week. Bob's average weekly sales is 70 units with a standard deviation of 15. Bob works 45 weeks a year.
Sunday, September 18, 2011 at 6:30pm

Statistics
Please advise how do I get the Regular % and the Cummulative % I just need one example other wise I will lose what's left of my mind. Defect Description Qty Improperly Sized 258 Bad Seam 153 Missing Buttons 67 Fabric Flaw 22 500
Sunday, September 18, 2011 at 4:11pm

Statistics
The heights in inches of 14 randomly selected adult males in LA are listed as: 71, 67, 70, 59, 71, 68, 67, 71, 80, 68, 74, 69, 72, 68 Display the data in a stem and leaf plot. find the mean, median, mode, range, variance, and standard deviation.
Sunday, September 18, 2011 at 1:52pm

Statistics
If I know the mean and ÓX, how do I find n ?
Sunday, September 18, 2011 at 1:27am

statistics
A survey was conducted to determine the proportion of male and female respondents who are in favor of a sales training program of a bottling company. 120 out of 400 males and 130 out of 500 females are in favor of the issue. Is there a significant difference in the proportion ...
Sunday, September 18, 2011 at 12:09am

statistics
It is known from the records of the City Schools that the standard deviation of Algebra scores is 6.0. A sample of 200 students from the system was taken and was found out that the sample mean score is 75. Previous tests showed the population mean to be 70. Is it safe to ...
Sunday, September 18, 2011 at 12:07am

Statistics
20. A study involves measuring the number of days absent from work for 216 employees of a large company during the preceding year. As part of the results, the researcher reports, “The number of days absent during the preceding year (M = 9.21; SD = 7.34) was . . . .” ...
Saturday, September 17, 2011 at 10:33pm

statistics
Pleas HeLp!!!!!!!!!! A random sample of the test scores of 100 applicants for college entry at a large junior college showed a mean score of 72.6. Determine a 99%, 95%, and 90% confidence interval for the m mean score of all applicants at the junior college. Assume the ...
Saturday, September 17, 2011 at 10:00pm

statistics
72% working women use computers choose 5 at random whats the probility at least 1 does not use a computer whats the probility that all 5 use a computer
Saturday, September 17, 2011 at 12:44pm

statistics
Let a random variable be distributed as shown below X=x : 0,1,2,3,4,5,6 P(x): .1 .09 .2 .15 .16 .2 (a) Find the probability p(6) (b) Find the probability P(3< X < 5) (c) Find the probability P(X < 4) (d) Find the probability P(X > 2)
Saturday, September 17, 2011 at 11:01am

statistics math
two un biasedtetrahedral dice each have four faces number 1,2,3 and 4. the two dices are thrown together and the sum of the numbers on the faceson which they land is noted. Find the expected number of occasions on which the sum is 7 or more when the dice are thrown together ...
Saturday, September 17, 2011 at 11:01am

Statistics
The lifetime of television produced by the Hishobi Company are normally distributed with a mean of 75 months and a standard deviation of 8 months. If the manufacture wants to have to replace only 1% of its televisions, what should its warranty be?
Friday, September 16, 2011 at 11:08pm

Statistics
X is normally distributed with a mean of 250 and a standard deviation of 40. What value of X does only the top 15% exceed?
Friday, September 16, 2011 at 11:06pm

statistics
What is the relationship between Sample Size and the width of the Confidence Interval? Please explain further as to why
Friday, September 16, 2011 at 8:09pm

statistics
if a data set has mean 70, and standard deviation 5, is 80 asuspect outliner/
Thursday, September 15, 2011 at 9:25pm

statistics
assume the mean height of soldiers to be 68.22 inches with a variance of 10.8 inches. how many soldiers in a regiment of 1000 would you expect to be over 6 feet tall
Thursday, September 15, 2011 at 1:59pm

statistics
Lubbock, Texas ran a survey and determined that 27% of all households subscribed to the daily paper, 32% watched the evening news, and 9% did both. If a household is chosen at random, what is the probability that the evening paper was received or the news was watched?
Thursday, September 15, 2011 at 11:11am

statistics
An office has 8 secretaries and 5 computer operators. If one employee is picked at random, find the probability that it will be a secretary.
Thursday, September 15, 2011 at 11:10am

statistics
If a card is drawn at random from a deck of 52, what is the probability that it is an ace or a heart?
Thursday, September 15, 2011 at 11:09am

statistics
37% of all doctors are family practitioners. If four doctors are picked at random, what is the probability that all four are family practitioners? a.1.48 b.0.0187 c. 0.0168 d. .1369
Thursday, September 15, 2011 at 11:07am

Economics
You have just started work for a small company, FitCo, that develops private fitness clubs in small towns. FitCo buys or leases a local hotel or motel, then renovates to provide a gym, swimming pool, sauna, Jacuzzi, and a small café where patrons can buy juices, ...
Thursday, September 15, 2011 at 2:08am

statistics
You ask a neighbor to water a sickly plant while you are on vacation. Without water the plant will die with probability 0.8. With water it will die with probability 0.4. You are 87 % certain the neighbor will remember to water the plant. You come back from the vacation and the...
Wednesday, September 14, 2011 at 11:31pm

Statistics
I have 33 whole number observation data set. The five number set from the box and whisker plot is 16, 20, 22, 30, 46). How many observations are strictly less than 22(answer should be a ra nge of numbers)? Is it possible that there is no observation equal to 22? Explain ...
Wednesday, September 14, 2011 at 11:22pm

Statistics
I have 33 whole number observation data set. The five number set from the box and whisker plot is 16, 20, 22, 30, 46). How many observations are strictly less than 22(answer should be a ra nge of numbers)? Is it possible that there is no observation equal to 22? Explain ...
Wednesday, September 14, 2011 at 11:02pm

Statistic
I am supposed to find the SD from the SE for the last two main effects. What I have so far is Verbal (M = 36.34, SD =___ ),(M = 44.02, SD = __), score averaged across grades 3 and 5 lower for AC schools (M = 36.25, SD =__ ) than for non AC schools (M = 44.12, SD = __). The ...
Wednesday, September 14, 2011 at 3:55pm

statistics
Use x2prk formula to find the percentile rank of 84
Wednesday, September 14, 2011 at 2:43pm

statistics
Sketch the boxplot for mpuls and label it with the 5-number summary
Wednesday, September 14, 2011 at 2:41pm

statistics
Determine the quartiles q1, Med,q3, for mpuls
Wednesday, September 14, 2011 at 2:39pm

statistics
Determine the cvars of the entrance exams sat, 1518,325 and act 21.1,4.8
Wednesday, September 14, 2011 at 2:37pm

statistics
Use x2prk formula to find the percentile rank of 84
Wednesday, September 14, 2011 at 9:51am

statistics
Sketch the boxplot for mould,and label it with the 5-number summary
Wednesday, September 14, 2011 at 9:49am

statistics
Determine the quartiles q1,Med,q3 for mpuls
Wednesday, September 14, 2011 at 9:47am

statistics
Determine the cvars of the entrance exams sat,1518,325 and act,21.1,4.8
Wednesday, September 14, 2011 at 9:45am

Statistics
I have two boxes with balls; box #1 and box #2. Box #1 has 3 red balls and 2 blue balls.Box #2 has 7 red balls and 3 blue balls. what is the probability that if a red ball is picked, it is from box #1
Tuesday, September 13, 2011 at 3:48pm

statistics
Based on data collected by the National Center for Health Statistics and made available to the public in the Sample Adult database, an estimate of the percentage of adults who have at some point in their life been told they have hypertension is 23.53 percent. If we select a ...
Tuesday, September 13, 2011 at 2:26pm

statistics
draw a tree with elements(50,33,44,22,77,35,60,40)respect​ively inorder
Tuesday, September 13, 2011 at 1:17am

Statistics
I you are told that a data set has a mean of 25 and a variance of 0 you can conclude that A)There is only one observation in the data set B) There are no observations in the data set C)All of the observation in the data set are 25 D)Someone has made a mistake E) None of the ...
Tuesday, September 13, 2011 at 12:24am

statistics
In one elementary school, 200 students are tested on the subject of Math and English. The table below shows the mean and standard deviation for each subject. Mean SD Math 67 9.58 English 78 12.45 One student’s Math score was 70 and the same individual’s English score...
Monday, September 12, 2011 at 10:48pm

statistics
A salesperson finds that, in the long run, two out of five sales calls are successful. Twelve calls are to be made. Let X = the number of concluded sales. Is X a binomial random variable? Explain!
Monday, September 12, 2011 at 10:36pm

statistics
It appears to people who are mildly obese are less active than leaner people. One study looked at the average number of minutes per day that people spend standing or walking. Among mildly obese people, minutes of activity varied according to the N(373,67) distribution. Minutes...
Monday, September 12, 2011 at 8:23pm

statistics
A production process historically produces 95% items that are considered acceptable quality-wise and 5% that are defective.A sample of 50 items is taken. Determine the following probablities: Probability that exactly 47 items will be good.
Monday, September 12, 2011 at 2:01pm

basic statistics for the behavioral sciences
on a standard test of motor coordination, a sports psychologist found that the population of a average bowlers had a mean scores of 24,with a standard deviation of 6. she tested a random sample of 30 bowling alley and found a sample mean of 26, a second random sample of 30 ...
Monday, September 12, 2011 at 12:53am

Essay Check
This is an essay about the article called Rambo's of the road, could you please read it and see if I am getting there? It is supposed to be a critique. Note: This is not a spellcheck or proofread, I just want someone to read it and tell me if it is alright and makes sense...
Sunday, September 11, 2011 at 1:04pm

statistics
a sample of 120 men and women randomly divided into 3 groups with 40 people per group. group 1 members varied their workouts. group 2 performed the same exercise at each workout. group 3 had no set schedule or regulations for their workouts. by the end of the study 18 people ...
Saturday, September 10, 2011 at 7:16pm

Statistics
Given the list 10,7,5,3,-6 find by hand, mean,meadian, midrange, mode(s), range, popvar, and sample standard deviation. (seven problems)
Saturday, September 10, 2011 at 4:14pm

Statistics
Suppose you administered an anxiety test to a large sample of people and obtained normally distributed scores with a mean of 45 and standard deviation of 4. There are 200 students in a sample. How many of these students will have scores that fall under the score of 41?
Friday, September 9, 2011 at 11:10pm

statistics
Suppose you administered an anxiety test to a large sample of people and obtained normally distributed scores with a mean of 45 and standard deviation of 4 There are 200 students in a sample. How many of these students will have scores that fall under the score of 41?
Friday, September 9, 2011 at 11:06pm

Statistics
1. The mean and standard deviation of the grades of a group of students who took an economic exam  were 69 and 7, respectively. The grades have a mound-shaped distribution. According to the Empirical Rule,    a) Approximately 68% of the grades were between which...
Friday, September 9, 2011 at 9:10pm

statistics
write a data set that fits the following description. there are 7 numbers in the data set the minimum is 17 the range is 45 the median is 32 the mode is 41
Friday, September 9, 2011 at 3:50pm

basic statistics for the behavioral sciences
(a)on a normal distribution of exam scored, poindexter scored at the 10th percentile, so he claims that he outperformed 90% of his class. Why is he correct or incorrect? Because Foofy's score is in a tail of the distribution, she claims she had one of the highest scores on...
Friday, September 9, 2011 at 2:47pm

statistics
MEAN=80,SD=10, S=8, N=25 E(M)= SE(M)=
Friday, September 9, 2011 at 11:29am

Psychology Statistics
Determine whether the numerical value is a parameter or a statistic? In a phone survey of 100 random homes in a country, 21 families had garages. Is this a parameter because the data set of 100 random homes is a population? Is this a statistic, because the data set of 100 ...
Friday, September 9, 2011 at 8:27am

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