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No. & Date Asked  Question 

# 945 :: 4/29/12

In a survey of 1000 electors, 20% were found to favour party "stats".
1. Construct a 95% C.I for the percentagew in favour of party "stats".
2. What. . .
Confidence Intervals,
Sample Size 
# 869 :: 10/14/10

You need to estimate the mean Christmas sales across a large chain of jewelry stores. You want to estimate this mean value to within $100 with 99% co. . .
Sample Size 
# 836 :: 1/13/10

a statistician was setting up a hypothesis test with a level of significance dictated by upper management. However, she was concerned that the test wo. . .
Type II Error,
Sample Size 
# 821 :: 10/18/09

A manufacturer can typically process 176264 devices a given period of concern. In this situation the processing event is either pass or fail. There i. . .
Power,
Sample Size,
Effect Size,
1Proportion Test 
# 781 :: 7/14/09

I am to do a study that involves people whose IQ are in the normal range 70 to 130. How many people must I screen with IQ test in order to find a samp. . .
Sample Size 
# 720 :: 5/5/09

City Opera, a local opera company, wishes to take a sample of its subscribers to learn the average number of years people have been subscribing. The d. . .
Sample Size 
# 685 :: 4/18/09

NKU needs to estimate the mean number of hours that all students work to earn money, on average, per week during the full semesters (fall and spring).. . .
Sample Size,
Margin of Error 
# 632 :: 2/19/09

An automobile manufacturer wants to estimate the mean gasoline mileage that its customers will obtain with its new compact model. How many sample runs. . .
Sample Size,
Margin of Error 
# 551 :: 12/12/08

Philadelphia is conducting a study on the characteristics of tourists who drive to Eagles football games. Previous studies indicate that approximately. . .
Sample Size,
Confidence Intervals,
Proportion 
# 512 :: 11/14/08

When estimating the mean of a population, how large must the sample be in order that the 95% error margin is 1/8 the standard deviation?. . .
Sample Size,
Margin of Error,
Standard Deviation,
Standard Error of the Mean 
# 510 :: 11/13/08

Survey to determine what proportion of new car buyers continue to have their car serviced at the dealership after warranty ends. Estimates 30% of cust. . .
Sample Size,
Confidence Level 
# 509 :: 11/13/08

A researcher expects the population proportion of the Cubs Fans in Chicago to be 80%. Error of less than 5% confident of an estimate to be made from a. . .
Confidence Intervals,
Sample Size,
Margin of Error 
# 508 :: 11/13/08

In a national wide survey a researcher expects 30 percent of the population will agree with an value statement. He wishes to have less than 2% error a. . .
Sample Size,
Margin of Error,
Confidence Level 
# 507 :: 11/12/08

In a survey of 500, 60% responded positively to an value question.
Calculate a confidence level at 95% to get an interval estimate for proportion?. . .
Sample Size,
Confidence Intervals,
Proportion 
# 506 :: 11/12/08

Suppose you are planning a sample of employees to determine the monthly average # of vacation days. Standards set: Confidence level of 99% and an erro. . .
Sample Size,
Margin of Error,
Confidence Intervals 
# 495 :: 11/4/08

The EPA range for a car is 2028mpg, how large of a sample would be required to estimate your mean mpg with an error of +/ 1 mpg with 90% confidence. . .
Sample Size 
# 471 :: 10/9/08

A central university has a student population of 60,000. The university is interested in determining what proportion of them is in favour of a new gra. . .
Margin of Error,
Confidence Intervals,
Sample Size 
# 453 :: 10/4/08

A central university has a student population of 60,000. The university is interested in determining what proportion of them is in favour of a new gra. . .
Sample Size,
Margin of Error 
# 450 :: 10/3/08

A researcher is interested in estimating the average salary of fire fighters in a large city. He wants to be 95% confident that his estimate is correc. . .
Margin of Error,
Sample Size 
# 371 :: 9/8/08

Can you give me a formula to calculate sample size?. . .
Sample Size,
Margin of Error 
# 369 :: 9/5/08

A random sample of 10 miniature Tootsie Rolls was taken from a bag. Each piece was weighed on very accurate scale. The results in grams were 3.087 3.. . .
Margin of Error,
Sample Size,
Confidence Intervals 
# 364 :: 9/4/08

A sample of 20 pages was taken without replacement from the 1,591page phone directory Ameritech Pages Plus Yellow Pages. On each page, the mean area . . .
Margin of Error,
Confidence Intervals,
Sample Size 
# 362 :: 9/1/08

Popcorn kernels take between 100 and 200 seconds to pop. What sample size (number of kernels) would be needed to estimate the true mean seconds to pop. . .
Small Sample,
Sample Size,
Margin of Error,
Confidence Intervals 
# 339 :: 8/12/08

My question is really about sample size. Say you work at a facility and want to perform an assessment of your safety culture – this would involve mul. . .
Sample Size,
Margin of Error 
# 214 :: 6/2/08

I am charged with sampling expense report submissions for accuracy. We get 8000 T&E claims, and want to sample a subset making inferences about the p. . .
1sample ttest,
Confidence Intervals,
Sample Size 
# 211 :: 5/29/08

State the main points of the Central Limit Theorem for a mean. B. Why is population shape of concern when estimating a mean? What does sample size hav. . .
Central Limit Theorem,
Sample Size 
# 203 :: 5/22/08

How to determine the sample size for comparing mulltiple parameters like Height , weight, Blood pressure , Blood parameters like blood glucose, total. . .
Sample Size,
Power,
ANOVA,
ttest 
# 197 :: 5/15/08

Annual starting salaries for college graduates with degrees in business administration are generally expected to be between $30,000 and $45,000. Assum. . .
Normally Distributed,
Standard Deviation,
Margin of Error,
Sample Size 
# 6 :: 10/23/07

How do you determine the sample size for data for which the mean and standard deviation are not known?. . .
Standard Deviation,
Sample Size,
Margin of Error 