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February 28, 2015

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Number of results: 14,316

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

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

statistics
A manufacturer wishes to estimate the reliability (in months) of a certain product. An estimate of the population standard deviation from a previous sample was 12 months. If the manufacturer desires to be within 4 months of the true value with approximately 80% confidence, ...
November 8, 2011 by Larry

statistics
You are a travel agent and wish to estimate, with 98% confidence, the proportion of vacationers who use an online service or the Internet to make travel reservations. Your estimate must be accurate within 4% of the population proportion. a) No preliminary estimate is available...
April 6, 2011 by alex

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

statistics
How does the sample size differ between qualitative and quantitative methods? Why?
October 20, 2008 by nicky

statistics
2. How does the sample size differ between qualitative and quantitative methods? Why?
October 22, 2008 by nicky

statistics
If a sample of size 30 is selected, the value of A for the probability P(t greater or less A) = 0.01 is?
August 1, 2009 by Lina

statistics
Population Mean: 170 STD: 62.3 Sample size 100 95% CI 99%CI
February 10, 2014 by Anonymous

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

algebra
in triangle ABC, the size of angle B is 5 times the size of angle A and the size of angle C is 9 degrees less than 4 times the size of angle A Find the size of angle A
February 17, 2012 by Anonymous- boy

math
identify the variable, population and is this quantitative or qualitative The archaeological site of Tara is more than 4000 years old. Tradition states that Tara was the seat of the high kings of Ireland. Because of it's archaeological importance, Tara has received extensive ...
June 8, 2013 by marie

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

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

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
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

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

statistics(please answer!)
Find a t score (a) such that P( -a < t < a) = 0.95. Asume sample size n = 10.
January 20, 2015 by cdizzle

statistics(please answer!)
find a t score (a) such that P( -a < t < a) = 0.95. Asume sample size n = 10.
January 20, 2015 by lovely

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

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(0X0.4) b.P(0.4X1) c.P(0.3X0.5) d.P(0.3(<X<0.5) e.P(0.226X0.713) f.What ...
March 10, 2009 by chris

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
Hoping to lure more shoppers downtown, a city builds a new parking garage in the central business district. The city hopes that the parking revenues will pay for the garage. During a recent two month period (44 days), the city statistician calculated the 95% confidence ...
November 10, 2013 by Katie

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

business
MGT635-1003B-04 International Business Operations Management Assignment Name: Unit 5 Individual Project Deliverable Length: 6-7 body pages Details: As the production manager for an electronic circuit company you have encountered the following situation. Part 1 A process for ...
August 15, 2010 by 1SGCalhoun

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
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

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

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
the assets (in billions of dollars)of the four wealthiest people in a particular country are 46,34,12,10. Assume that the samples of size 2 are randomly selected with replacement from this population of four values. After listing the possible sample and finding the mean of ...
December 20, 2011 by nannie

statistics
a recent study by a large retailer designed to determine whether there was a relationship between the importance a store manager placed on advertising and the size of the store revealed the following sample information: observed frequencies(sample)small-medium-large what kind ...
February 23, 2012 by markeda

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
The effect size in this hypothetical trial (2.7 fewer infections per 1000 vaccinated) is slightly smaller than the effect size found in the real 2009 HIV vaccine trial (2.8 fewer infections per 1000 vaccinated); so why is the p-value smaller? The hypothetical trial has less ...
July 15, 2013 by Rupal

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 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

Statistics
Formula used to easily calcuate sample size. Please give example.
January 26, 2010 by Bryant

statistics
Sample size is 24, Mean rate of 6.50%, Standard Deviation is 1.20. Calculate 90% of confidence interval
October 14, 2010 by sue

chemistry
what sample size of .9181M vinegar would require 27.50 mL of .5185M of NaOH for neutralization?
April 13, 2011 by maddie

Math
Determine whether a correlation coefficient of r = 0.405 is significant at the 5% level for a sample size of 22
January 27, 2012 by Constance

7th grade Math
If there is a population of 800 deer what would be a good sample size and why.
September 6, 2013 by Brandi

Math
Determine whether a correlation coefficient of r = 0.471 is significant at the 5% level for a sample size of 20.
July 12, 2014 by Shelagh

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
(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
A quality control inspector wants to estimate the mean inside diameter of the washers produced by a certain machine. A preliminary sample indicates that the inside diameters have a standard deviation of 0.30 millimeters. What sample size does he need to estimate the mean to ...
December 6, 2012 by Carolyn

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 = 514.6 and standard deviation = ...
April 19, 2012 by Anonymous

Statistics
Calculate the following: a) Determine the sample size necessary to estimate a population mean to within 1 with a 90% confidence given that the population standard deviation is 10. b) Suppose that the sample was calculated at 150. Estimate the population mean with 90% confidence.
March 13, 2010 by Tom

STATS Math
Suppose a simple random sample of size n=150 is obtained from a population whose size is N=20,000 and whose population proportion with a specified characteristic is p=0.8. Please answer questions (1) through (5) below. (1) describe the sampling ditriribution of p^ (choose the ...
November 26, 2014 by LADO

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

Statistics
Suppose we have yo estimate the average number of purchases in a given hour in a given hour at a convenient store. Using this example describe in your own words how you would go about this determining this average through: A.) Drawing a random sample B.) A Systematic sample C...
February 9, 2015 by Phyiss

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
Total plasma volume is important in determining the required plasma component in blood replacement theory for a person undergoing surgery. Plasma volume is influenced by the overall health and physical activity of an individual. Suppose that sample of some male firefighters ...
July 7, 2012 by Desperate

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

Econ 112
A researcher believes that the average size of farms in the U.S. has increased from the 2002 mean of 471 acres. She took a sample of 23 farms in 2011 to test her belief and found a sample mean of 498.8 acres and a sample standard deviation of 46.9 acres. At a 5% levelof ...
June 18, 2013 by Help

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

Algebra 2: Prob and Stats
Find the sample size that produces the margin of error +-4.0% a) 325 b) 25 c) 16 d) 625
May 24, 2010 by Skye

statistical applicatons
Why is it important to learn what sample size was used in a study in which no statistica difference was found?
July 10, 2010 by Jerry

statistics
What is the relationship between Sample Size and the width of the Confidence Interval? Please explain further as to why
September 16, 2011 by denise

Stats Math 3
Suppose a simple random sample of size n=150 is obtained from a population whose size is N=20,000 and whose population proportion with a specified characteristic is p=0.8. Please answer questions (1) through (5) below. (1) Describe the sampling distribution of p^ (choose the ...
November 26, 2014 by LADO

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
Listed below are the duration's (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 why not? 71 100 237 199 164 269 193 379 252 233 388...
February 11, 2015 by slomo

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

Math
James Profit wants to take National Widget Company public. He is interested in the relationship between the size of the initial public offering and the price per share. A sample of 10 companies that recently went public revealed the following information: size($M)price per ...
September 15, 2008 by Student

Statistics
An investigational drug study is being conducted. The initial screening phase needs to include enough people so that the final (approved) group has at least 10 patients. The probability of a person being approved for the study is .80. what initial sample size is needed to make...
June 6, 2009 by Craig

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

Algebra 2
Suppose you did a survey of male shoes size and the mean of that survey was size 10 with a standard deviation of 1.5. What is the z-score of a size of 7.5?
June 7, 2011 by Adam

Math
Suppose you did a survey of male shoes size and the mean of that survey was size 10 with a standard deviation of 1.5. What is the z-score of a size of 7.5?
June 7, 2011 by Wyeth

Statistics
Use the 5-step hypothesis testing framework to answer the following 2 questions: Step One: Stating the hypothesis Step Two: Choosing the appropriate test statistic Step Three: Developing a decision rule Step Four: Calculating the value of the test statistic Step Five: Stating ...
February 19, 2015 by Shayna

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

math statistics
The average price of a gallon of unleaded regular gasoline was reported to be $2.34 in northern Kentucky (The Cincinnati Enquirer, January 21, 2006). Use this price as the population mean, and assume the population standard deviation is $.20. 1. What is the probability that ...
October 19, 2009 by aaron

math statistics
please help me I've waited for hours The average price of a gallon of unleaded regular gasoline was reported to be $2.34 in northern Kentucky (The Cincinnati Enquirer, January 21, 2006). Use this price as the population mean, and assume the population standard deviation is $....
October 19, 2009 by aaron need urgent help

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

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