Wednesday

January 28, 2015

January 28, 2015

Number of results: 11,301

**statistics**

From a shipment of 350 batteries, a sample of 125 was selected at random and tested. If 25 batteries in the sample were found to be dead, how many dead batteries would be expected in the entire shipment?
*February 13, 2013 by Anonymous*

**statistics**

Assume a simple random sample has been taken, the conditions for binomial distribution are met and the sample proportions can be approximated by a normal distribution. In order to evaluate a course of therapy to treat brain tumors, a sample of 300 patients revealed that 96 ...
*December 5, 2012 by Ox*

**statistics**

Assume a simple random sample has been taken, the conditions for binomial distribution are met and the sample proportions can be approximated by a normal distribution. In order to evaluate a course of therapy to treat brain tumors, a sample of 300 patients revealed that 96 ...
*December 5, 2012 by Ox*

**statistic****help*******

Show all your work. Indicate clearly the methods you use because you will be graded on the correctness of your methods as well as on the accuracy of your results and explanation. A simple random sample of adults living in a suburb of a large city was selected. The age and ...
*March 19, 2014 by akiba*

**statistics**

Suppose that large dogs weights are normally distributed with a mean of 100 pounds and a standard deviation of 10 pounds. If one of these dogs is picked random: a) what is the probability that the dog will weigh over 110 pounds? b) what is the probability that the dog will ...
*March 26, 2010 by Anonymous*

**statistical applications**

when is random sampling not the best approach to sample selection?
*March 8, 2010 by anette*

**math **

Find the probability between 42 and 48 speeders in a random sample of 100
*May 2, 2013 by john jones*

**Math**

A vending machine has marbles of 4 different colors: Red, blue, purple,and yellow. The marbles are well mixed. You drop a quarter into the machine and you get 2 random marbles. Write out the sample space for the experiment. The sample space should be N = 10.
*July 11, 2012 by Meredith*

**STATISTIC***HELP**

Show all your work. Indicate clearly the methods you use because you will be graded on the correctness of your methods as well as on the accuracy of your results and explanation. A simple random sample of adults living in a suburb of a large city was selected. The age and ...
*March 18, 2014 by KIBA*

**maths**

a box contains 20 fuses ,out of which ,5 are defective.if a sample of 3 fuses is chosen from the box at random without replacement,find the probability that x fuses in this sample will be defective
*February 11, 2012 by ashely*

**statistic**

For a given month, a random sample of 30 sales girls from a superstore has a sample mean of salary of RM 800 with standard deviations of RM 140. Estimate the mean monthly salary for all employees using the 95% confidence interval.(what does mean of 95% confidence level?)
*September 27, 2011 by niki*

**statistics**

1. A random sample of size 49 is taken from a large population, measuring the time it takes to complete a driver’s license examination. The sample mean was found to be 47 minutes, and the sample standard deviation 5.89 minutes. Construct a 95% confidence interval around the ...
*July 17, 2010 by Anonymous*

**Statistics**

I have another Stats question i'm confuesed on. classify the sample as random, systematic, covenience, stratified, or cluster. A marketing executive fo General Motors finds that its public department has just printed envelopes with the names and addresses of all Corvette ...
*January 21, 2013 by Gavin*

**Stats**

Recently, an automobile insurance company performed a study of a random sample of 15 of its customers to determine if there is a positive relationship between the number of miles driven and the age of the driver. The sample correlation coefficient is r=.38. Given this ...
*June 13, 2011 by Breezy*

**AP Stat**

A random sample of 15 people is taken from a population in which 40% favour a particular political stand. What is the probability that exactly 6 individuals in the sample favour this political stand? 0.4000 0.5000 0.4000 0.2066 0.0041
*November 24, 2009 by Cb*

**Math Stats**

Suppose that a random sample of n kernels of popcorn is taken and x of these kernels pop. The buyer wants to be 95% sure that the point estimate for p will be within 0.01.If no preliminary study is done to estimate p, how large a sample should the buyer use? If a preliminary ...
*March 28, 2012 by Apryl*

**Statisics **

I need help on this question i am confused. I don't think the answers i got are right The library checks out an average of 320 books per day, with a standard deviation of 75 books. Suppose a simple random sample of 30 days is selected for observation. What is the probability ...
*February 20, 2011 by Mike*

**Statistics**

a laptop manufacturer finds that the average time it takes an employee to load a laptop with software is 20 minutes with a standard deviation 8 minutes. suppose you take a random sample of 81 employees. the standard deviation of the sample mean is?
*October 6, 2014 by Kalyssa*

**Math**

will someone just double check my answers, please. Identify which types of sampling is used:random,stratified, systematic,convenience. 1. a sample consists of every 20th student who leaves the bookstore. answer:systematic 2. a pollster uses a computer to generate 500 random ...
*April 15, 2010 by Charlene*

**STATISTICS**

The number of boxes of girl scout cookies sold by each of the girl scout in a city has a distribution which is approximately normal with a mean=75 boxes and a standard deviation=30 boxes.... 1.) find the probability that scout chosen at random sold between 60 and 90 boxes. 2...
*August 10, 2011 by Mason*

**Math**

At your summer with a research company, you must get a random sample of people from your town to answer a question about spending habits. Which of the following Methods is most likely to be random? a)You survey customers at the local shopping mall b)You survey people chosen ...
*May 28, 2014 by Dope Fresh Nation*

**STATISTICS HELP PLEASE!**

suppose you wish to estimate a population mean based on a random sample of n observations, and prior experience suggests that sd=12.7. if you wish to estimate the mean correct to within 1.6, with probability equal to .95, how many observations should be included in your sample?
*November 15, 2010 by Courtney*

**statistics**

A psychologist wants to estimate the variance of employee test scores. A random sample of 18 scores had a sample standard deviation 10.4. Find a 90% confidence 2 interval for the population variance. What assumption, if any, have you made in calculating this interval estimate?
*November 9, 2011 by Janelle*

**statistics**

The average temperature in households is 67.6 degrees F. The standard deviation is 4.2 degrees F. A random sample of 51 households is to be selected What is the probability that the average of this sample will be within 1.4 STANDARD ERRORS of the population mean?
*September 28, 2012 by Kristin*

**statistics**

The scores of students on the ACT college entrance examination in a recent year had a normal distribution with a mean of 18.6 and a standard deviation of 5.9. A simple random sample of 50 students who took the exam is selected for study: A) What is the shape, mean, and ...
*November 6, 2008 by Marshall*

**stats of biologists**

a manufacturer claims that the life time of a certain brand of batteries has a varaince of 5000(hours)^2. a sample of 26 has a variance of 7200(hours)^2. assuming that it is reasonable to treat these data as a random sample from a normal population, test the manufacturer's ...
*February 14, 2013 by Aboli*

**ap stats need help**

Continuous Random Variable, I Let X be a random number between 0 and 1 produced by the idealized uniform random number generator described. Find the following probabilities: a.P(0¡ÜX¡Ü0.4) b.P(0.4¡ÜX¡Ü1) c.P(0.3¡ÜX0.5) d.P(0.3(<X<0.5) e.P(0.226¡ÜX¡Ü0.713) f.What ...
*March 10, 2009 by chris*

**Probability and Statistics**

A research psychologist believes that professional athletes tend to be more confident than the typical person. From previous testing, he knows that the scores for people in the general population are approximately normally distributed with a mean of 72 and standard deviation ...
*April 29, 2012 by Kim*

**Statistics 2 please give answers to the below ques**

According to a study conducted by a statistical organization, the proportion of americans who are satisfied with the way things are going in their lives is 0.82. Suppose that a random sample of 105 Americans is obtained. (Please answer the below and round to four decimals ...
*November 26, 2014 by LADO*

**statistics**

A random sample of 384 people in Dalto City, a mid-sized city, revealed 112 individuals who work at more than one job. A second random sample of 432 workers from East Dettweiler, another mid-sized city, found 91 people who work at more than one job. To conduct a significance ...
*October 26, 2012 by Derp*

**statistics**

A random sample of 384 people in Dalto City, a mid-sized city, revealed 112 individuals who work at more than one job. A second random sample of 432 workers from East Dettweiler, another mid-sized city, found 91 people who work at more than one job. To conduct a significance ...
*November 4, 2012 by John*

**Statistics**

A random sample of 384 people in Dalto City, a mid-sized city, revealed 112 individuals who work at more than one job. A second random sample of 432 workers from East Dettweiler, another mid-sized city, found 91 people who work at more than one job. To conduct a significance ...
*November 5, 2012 by John*

**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...
*May 9, 2012 by Matt*

**math**

The sample mean to be calculated from a random sample of size n= 4 from a population consistsof eight measurements (2, 6, 9, 12, 25, 29, 39, 50) . find the sampling distribution of y y .(hint : there are 70 samplesof size 4 when sampling from a population of eight measurements )
*November 13, 2010 by heba*

**statistics **

The sample mean to be calculated from a random sample of size n= 4 from a population consists of eight measurements (2, 6, 9, 12, 25, 29, 39, 50) . find the sampling distribution of y .(Hint : there are 70 samples of size 4 when sampling from a population of eight measurements )
*November 14, 2010 by koky*

**statistics**

A simple random sample of 40 items resulted in a sample mean of 25. The population standard deviation is 5. a. What is the standard error of the mean (to 2 decimals)? b. At 95% confidence, what is the margin of error (to 2 decimals)?
*April 21, 2014 by Vanessa*

**Statistics**

A survey organization takes a simple random sample of 625 households from a city of 80,000 households. On the average, there are 2.30 persons per sample household, and the SD is 1.75. Say whether each of the following statements are True or false and explain (a) The SE for the...
*October 26, 2011 by Joyann*

**Data Structures and Algorithms**

The "random" numbers produced by computers aren't purely random. They are actually pseudo-random, meaning that they are produced by mathematical formulas that simulate randomness.The linear congruential generator takes a seed X0 and generates subsequent pseudo-random numbers ...
*July 22, 2013 by John Berkhamp*

**Statistics**

How long does it take to have food delivered? A Chinese restaurant advertises that the mean delivery will be no more than 30` minutes. A random sample of delivery times is shown below. Based on this sample data, is the mean delivery time different than 30 minutes? Use a 5% ...
*March 25, 2012 by Jasmine*

**Stats**

It is known that the amount of time needed to change the oil in a car is normally distributed with a standard deviation of 5 minutes. A random sample of 100 oil changes yielded a sample mean of 22 minutes. Compute the 99% confidence interval estimate of the mean of the ...
*February 26, 2007 by Jason L*

**Statistics**

Suppose x has a distributionwith u=72 and 0=8 if random samples of size n=16 are selected, can we say anything about the x distributin of sample means if the originalx distribution is normal can we say anything about the x distribution of random samples of size 16 find p(68<...
*June 14, 2010 by John*

**stats**

An automobile repair shop has determined that the average service time on an automobile is 2 hours with a standard deviation of 32 minutes. A random sample of 64 out of 400 services is selected. What is the probability that this sample will have a mean service time greater ...
*November 11, 2009 by sandy*

**Statistics**

A university has 1,000 computers available for students to use. Each computer has a 250-gigabyte hard drive. The university wants to estimate the space occupied on the hard drives. A random sample of 100 computers showed a mean of 115 gigabytes used with a standard deviation ...
*October 27, 2013 by Shelby*

**mba business reserach methods**

Sampling A manufacturing company's quality control personnel have recorded the proportion of defective items for each of 500 monthly shipments of one of the computer components that the company produces. See data below. The company doesn't have time to review all of these. (a...
*March 20, 2011 by Carolina*

**Statistics**

The null and alternate hypotheses are: H0: μ1 = μ2 H1: μ1 ≠ μ2 A random sample of 15 items from the first population showed a mean of 50 and a standard deviation of 5. A sample of 12 items for the second population showed a mean of 46 and a standard ...
*October 21, 2012 by Anonymous*

**statistics**

Use the given confidence level and sample data to find a confidence interval for the population standard sigma. Assume that a simple random sample has been selected from a population that has a normal distribution. salaries of college graduates who took a geology course in ...
*December 29, 2011 by rich*

**statistics**

List below are the duration (in hours) of a simple random sample of all flights of a space shuttle program. Find the range, variance, and standard deviation for the sample data. Is the lowest duration time unusual? Why or hwy not? 73 95 238 199 166 268 198 374 260 235 382 339 ...
*October 29, 2013 by angela*

**Statistics**

Suppose that x has a distribution with = 10 and = 5. If a random sample is taken of size n = 44, find . 10.00 my answer was 0.75 is this correct 0.75 1.51 0.11 5.00
*June 20, 2010 by Jacob*

**Jared**

Suppose that x has a distribution with = 10 and = 5. If a random sample is taken of size n = 44, find . 10.00 0.75 1.51 0.11 my answer was 0.75 is this 5.00 correct
*June 20, 2010 by alex*

**statistics**

A random sample of n=36 scores is selected from a population. Will this have a definite normal distribution?
*March 17, 2011 by Leticia*

**statistics**

A random sample of size 36 is taken from a population with mean 50 and standard deviation 5. Find P( < 51.5).
*July 6, 2012 by dave*

**statistics**

A random sample of 100 of a population Mean is 31 and standard deviation 22 Approximate probability of 28
*April 27, 2013 by Dorri*

**statistics**

Twelve different video games showing substance use were observed and the duration times of game play (in seconds) are listed below. The design of the study justifies the assumption that the sample can be treated as a simple random sample. Use the sample data to construct and ...
*July 7, 2014 by Teniqua Evans*

**Math Help Please? c: Thank you :3 **

At your summer job with a research company, you must get a random sample of people from your town to answer a question about spending habits. Which of the following methods is most likely to be random? A) You survey customers at the local shopping mall. B) You survey people ...
*April 10, 2014 by X3 ISayRawr*

**STAT**

1. In a study of the income of U.S. factory workers, a random sample of 100 workers shows a sample mean of $35,000. Assume that the population standard deviation is $4,500, and that the population is normally distributed. A) Compute the 90%, 95% and 99% confidence intervals ...
*November 2, 2014 by Hugh*

**statistic**

Suppose a random sample of 25 students is selected from a community college where the scores in the final exam (out of 125 points) are normally distributed, with mean equal to 112 and standard deviation equal to 12. Find the probability that the sample mean deviates from the ...
*November 8, 2012 by Coco*

**Math please help**

According to a study conducted by a statistical organization, the proportion of americans who are satisfied with the way things are going in their lives is 0.82. Suppose that a random sample of 105 Americans is obtained. (Please answer the below and round to four decimals ...
*December 3, 2014 by LADO*

**statistics**

A random sample of size 49 is taken from a large population, measuring the time it takes to complete a driver’s license examination. The sample mean was found to be 47 minutes, and the sample standard deviation 5.89 minutes. Construct a 95% confidence interval around the ...
*July 17, 2010 by Anonymous*

**Statistics**

(TCO A) Consider the following age data, which is the result of selecting a random sample of 20 United Airlines pilots. 47 45 45 52 58 55 58 44 42 38 45 52 48 47 51 45 52 42 37 40 a. Compute the mean, median, mode, and standard deviation, Q1, Q3, Min, Max for the above sample ...
*September 6, 2012 by Pat*

**statistics**

you are asked to estimate the average weight of an adult male passenger for a study to maximize the number of seats in a certain airplane. you collect random weights of 1000 men passengers from a population of 100,000. you find that the average man in the sample weighs 180 ...
*December 19, 2011 by KK*

**algebra**

55% of the people in a town have brown eyes. you choose a random sample of 200 people to survey regarding their eye color. What is the mean and standard deviation of the proportion of people in your sample that have brown eyes?
*January 16, 2011 by Anonymous*

**Statistics**

please help having difficulty with this problem. It was noted that 40% of the people in Dallas read the morning newspaper. A random sample of 18 people is selected from the city. On average, how many people would you expect to read the morning newspaper in a sample of 18?
*December 13, 2012 by Stacy*

**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....
*May 18, 2012 by Mary*

**statistics**

Statistical Abstracts (117th edition) provides information aboutthe number of registered automobiles, including taxis, by state. The number ofregistered automobiles per 1,000 residents follows an approximately normaldistribution with mean ì = 514.6 and standard deviation ó = ...
*April 19, 2012 by Anonymous*

**AP Stats**

The mean weight of pears grown in a certain orchard is 6 ounces with a standard deviation of .5 ounces. A random sample of 30 pears is selected. What is the approximate probability that the sample mean weight is less than 5.5 ounces?
*April 25, 2010 by Lilly*

**college stats **

help please!!! 1. The average number of bumped passengers per day on FliRite Airlines is 2.47 with a standard deviation of 1.75. For a random sample of 40 days, what is the chance the average number of bumped passengers in the sample is between 2 and 2.75? a. About 91% b. ...
*July 12, 2013 by penelope*

**Statistics**

A new manager, hired at a large warehouse, was told to reduce the 26% employee sick leave. The manager introduced a new incentive program for the company's employees with perfect attendance. The manager decides to test the new program to see if it's better and plans to use a ...
*October 29, 2013 by Penny*

**statistics**

According to the MIT Airline Data Project, American Airlines controlled 15.5% of the domestic market in 2010. A random sample of 125 domestic passengers that year was selected. Using the normal approximation to the binomial distribution, what is the probability that more than ...
*July 20, 2014 by james*

**statistics**

the weights of shells follow a normal distribution. a random sample of 12 hybrid shells a a mean weight of 1.7 pounds with standard deviation 0.24 pounds. Find a 95 % confidence interval level for the mean weight if the fall catch is within 0.1 pounds of the sample estimate
*March 21, 2013 by Lost37*

**Math**

What is the propability that a random sample of 30 days in august has a mean high tempature less then 78 degreese?
*October 30, 2010 by Sherrie*

**statistics**

Let X be the average of a sample of 16 independent normal random variables with mean 0 and variance 1. Determine c such that P (X< c) = .5
*March 9, 2011 by Anonymous*

**Statistics**

There is a random selection of 150 students. What is the probablity that the sample percentage of correct identification is greater than 75%?
*June 18, 2013 by Katie*

**statistics**

The ages of commercial aircraft are normally distributed with a mean of 13.0 years and a standard deviation of 7.5 years what percentage of individual aircraft have ages greater than 15 years assume that a random sample of 49 aircraft is selected and the mean age of the sample...
*April 24, 2012 by Tanya*

**STATISTICS PLEASE HELP!!!!!**

are you a chocolate "purist", or do you like other ingredients in your chocolate? american demographics reports that almost 75% of consumers like traditional ingredients such as nuts or caramel in their chocolate. they are less enthusiastic about the taste of mint or coffee ...
*November 3, 2010 by Brittany*

**statistics**

Among 17 metal parts produced in a machine shop, 6 are defective. If a random sample of four of these metal parts is selected, find: (a) The probability that this sample will contain at least three defectives. (Do not round the intermediate answers. Round your answer to 4 ...
*April 8, 2011 by Kate*

**social psy **

I want to utilize a true experimental design to study the effects of classical music exposure on the cognitive development of newborns. a- What is an independent variable? b- What is a dependent variable? c-What is random assignment? d-Why is random assignment important? e-...
*October 3, 2011 by deb*

**Statistics**

Maureen is a cocktail hostess in a very exclusive private club. The IRS is auditing her tax return. Maureen claims that her average tip last year was $4.75. To support this claim, she sent the IRS a random sample of 52 credit card receipts showing her bar tips. When the IRS ...
*May 5, 2013 by Kay*

**statistics**

a random sample of 80 college students was selected to participate in a experiment. the mean of the sample is 317 points, the standard deviation of 37 there are 310 students that didn't complete the experiment 1. compute the appropriate test statistic? 2. what is the critical ...
*July 11, 2012 by Anonymous*

**statistics**

In this unit we have worked with scores and their locations within a distribution. This discussion is designed to get you to think a little more about distributions of scores. Shown below are two samples of scores. Input these scores into SPSS and use plots and data ...
*February 26, 2012 by john*

**Math**

In a random sample of 30 tires of the same type, it is found that the average life span is 36,200 miles with a standard deviation of 3800 miles. Find the interval about the sample mean such that the probability is 0.77 that the mean number lies within the interval. a. 35,402-...
*July 3, 2009 by Sophie*

**statistics**

Suppose a random sample of 25 students is selected from a community college where the scores in the final exam (out of 125 points) are normally distributed, with mean equal to 112 and standard deviation equal to 12. Find the probability that the sample mean deviates from the ...
*October 31, 2011 by Monique*

**Statistics**

In a population, heights of males are normally distributed with u=180 cm and sigma^2=16 cm^2, while the heights of females are normally distributed with u=170 cm and sigma^2= 25 cm^2. a) One random male and one random female are selected from the population i)What is the ...
*November 9, 2014 by William*

**alegbra**

Which of the following are examples of inferential statistics? Check all that apply. A.Finding the average (mean) of a set of numbers B.Testing every lightbulb produced by a company to confirm that each one works C.Testing random samples of lightbulbs produced by a company to ...
*April 17, 2012 by daryl*

**Statistics**

A random sample of 50 students has a test score average with a standard deviation of 10.9. Find the margin of error if c = 0.90.
*November 28, 2009 by Jessica*

**statistic**

in a random sample of 400 voter, 120 plan to vote for candidate A. determine a 95% confidence interval
*November 1, 2012 by John*

**geometry**

A number is selected at random from the set {2, 3, 4, … 10}. Which event, by definition, covers the entire sample space of this experiment?
*July 24, 2014 by cfd*

**statistics**

there are 450 employee in an organization. using the method of random sampling numbers, select a sample of 20 employees
*September 8, 2014 by Anonymous*

**Bosaso**

If a random sample of size 15 is selected from a symmetrical population with a unique mode, the degrees of freedom of the observation is
*January 6, 2015 by xalane*

**statistics**

A random sample of 84 shoppers were interviewed and 51 said they prefer to shop alone rather than with someone such as friends or family. Let p represent the proportion of all shoppers at this mall who would prefer to shop alone. Find a point estimate for p from the sample ...
*August 17, 2012 by Anonymous*

**statistics**

An important indicator of lung function is forced expiratory volume(FEV), which is the volume of air that a person can expire in one second. Dr. Jones plans to measure FEv in a random sample of n young women from a certain population, and to use the sample mean as an estimate ...
*February 16, 2008 by lauren*

**statistics**

1. A state’s department of education reports that 12% of the high school students in that state attend private schools. The state university wonders if the percentage is the same in their applicant pool. Admissions officers plan to check a random sample of the over 10,000 ...
*November 17, 2011 by fast eddie*

**AP tatistics**

A horticulturist wishes to estimate the mean growth of seedlings in a large timber plot last year. A random sample of n = 100 seedlings is selected and the one-year growth for each is measured. The sample yields = 5.62 cm. The known standard deviation for this popualtiopn is ...
*April 21, 2013 by Ann*

**statistics**

a random sample of 100 college students is taken from the student body of a large university. assume that a population mean of 20 hours and a population standard deviation of 15 hours describes the weekly study estimates for the entire student body. About 68 percent of the ...
*June 27, 2010 by jc*

**Statistics**

Any ideas please? Simple random sample of voters will be taken in a large state. Researchers will construct an approximate 95% confidence interval for the percent of the state¢s voters who will vote for Candidate A. Find the minimum sample size needed to ensure that the width ...
*July 24, 2013 by Andrew*

**statistics**

At a large publishing company, the mean age of proofreaders is 36.2 years, and the standard deviation is 3.7 years. If a random sample of 15 proofreaders is selected, find the probability that the mean age of the proofreaders in the sample will be between 36 and 37.5 years....
*October 22, 2010 by Cindy*

**Help with Statistics (T-value and decision rule)**

For a random sample of 12 observations, the sample mean was 407 and the standard deviation was 6. Using the .05 significant level, answer the following questions. What would the t value be? What is the decision rule? **** I think the t-value would be t = -3.0845 Any help would...
*December 5, 2014 by Jennifer*

**marketing**

Binomial probability distributions are used in business, science, engineering, and other fields. Suppose you work for a marketing agency and have to create a television ad for Brand A toothpaste. The toothpaste manufacturer claims that 40% of the toothpaste buyers prefer Brand...
*September 27, 2012 by Mark*

**statistics**

One of the ways most people relieve stress is to reward themselves with sweets. According to one study in Food Technology, 46 percent admit to overeating sweet foods when stressed. Suppose that the 46 percent figure is correct and that a random sample of 100 people is selected...
*July 1, 2014 by Alfie*

**Stats 330- HELP **

I need some help on this question it has two parts but i can't figure it out. Can someone help me. The NDSU library checks out an average of 320 books per day, with a standard deviation of 75 books. Suppose a simple random sample of 30 days is selected for observation. What is...
*March 10, 2011 by John*

**statistics**

A researcher wants to estimate the proportion of a population which possesses a given characteristic. A random sample of size 250 is taken and 40% of the sample possesses the characteristic. The 95% confidence interval to estimate the population proportion is
*January 22, 2011 by John*

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