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No. & Date Asked  Question 

# 949 :: 4/29/12

The desired percentage of silicon dioxide in a certain type of cement is 5. A random sample of 36 specimens gave a sample average percentage of 5.21 a. . .
1sample ttest 
# 920 :: 1/13/12

The average service time at CheesePlate Restaurant is 3.5 minutes with a standard deviation of .04 minutes. A new order system claims it can improve . . .
1sample ttest 
# 915 :: 12/6/11

create a 95%confidence interval for the value of the population mean, given that their is a sample mean of 49 and a standard deviation of 3 but now fo. . .
1sample ttest,
Confidence Intervals 
# 914 :: 12/6/11

create a 95% confidence interval for the value of the population mean, given that their are 64 observations and a sample mean of 49, with a sample sta. . .
1sample ttest,
Confidence Intervals 
# 908 :: 12/3/11

Create a 90% confidence interval for the value of the population mean using the following information: A sample mean of 65, a sample standard deviatio. . .
1sample ttest 
# 907 :: 12/3/11

Suppose that you have a sample mean of 49 and a standard deviation of 3, but now found those values from a sample of 20 observations. test the hypothe. . .
1sample ttest 
# 906 :: 12/3/11

You want to test the hypothesis that the mean age for teachers is equal to 50. If you take a sample of 64 observations and find a sample mean of 49, w. . .
1sample ttest 
# 895 :: 7/19/11

In a sample of n = 36 selected from a population, where X = 96 and S = 12, what is the value of tSTAT if you are testing the null hypothesis H0: µ = 1. . .
1sample ttest,
test statistic 
# 873 :: 1/3/11

During recent seasons, Major League Baseball has been criticized for the length of the games. A report indicated that the average game lasts 3 hours a. . .
1sample ttest 
# 846 :: 3/2/10

A recent article in The Wall Street Journal reported that the 30year mortgage rate is now
less than 6 percent. A sample of eight small banks in the . . .
1sample ttest 
# 845 :: 3/2/10

Dole Pineapple, Inc., is concerned that the 16ounce can of sliced pineapple is being
overfilled. Assume the standard deviation of the process is .03. . .
1sample ttest,
1sample Ztest 
# 844 :: 3/2/10

A new weightwatching company, Weight Reducers International, advertises that those
who join will lose, on the average, 10 pounds the first two weeks. . .
1sample ttest,
1sample Ztest 
# 838 :: 2/9/10

using the full 5step process test to see if a population mean is not 25. Sample data is: Mean 24, standard deviation 10 and a sample of 400 was taken. . .
1sample ttest 
# 833 :: 12/9/09

suppose that the census indicates the average American earns $36,345.45 per year. You are interested in the whether people who majored in political s. . .
Hypothesis Test,
1sample ttest 
# 744 :: 6/6/09

Quality Motors is an automobile dealership that regularly advertises in its local market area. It claims that a certain make and model of car averages. . .
1sample ttest 
# 729 :: 5/23/09

I want to prove that a population mean is not 150. Use an alpha of 5% and set up the full, detailed, five step hypothesis test. Assume when the sampl. . .
1sample ttest 
# 638 :: 2/23/09

To test the null hypothesis that the mean waist size for males under 40 years equals 34 inches versus the hypothesis that the mean differs from 34, th. . .
1sample ttest 
# 635 :: 2/22/09

Linemarking for parking bays shall be determined by the retroreflectivity performance of glass beads in the linemarking. The linemarking average level. . .
1sample ttest,
Confidence Intervals 
# 616 :: 2/7/09

Evolutionary theories often emphasize that humans have adapted to their physical environment. One such theory hypothesizes that people should spontane. . .
1sample ttest 
# 574 :: 1/14/09

Assume you have the following data: Ho mu = 200, s = 30, n = 64, and xbar
= 218. Conduct a hypothesis test at the .05 significance level.
Assum. . .
1sample ttest,
1sample Ztest 
# 569 :: 12/21/08

Faced with rising fax costs, a firm issued a guideline that transmissions of 10 pages or more should be sent by 2day mail instead. Exceptions are all. . .
1sample ttest,
TDIST 
# 563 :: 12/19/08

A vinyl siding company claims that the mean time to install siding on a mediumsize house is at most 20 hours with a standard deviation of 3.7 hours. . . .
1sample Ztest,
1sample ttest 
# 540 :: 12/9/08

A sample of 36 observations is selected from a normal population. The sample mean is 21, and the sample standard deviation is 5. Conduct the following. . .
1sample ttest,
1tailed test,
Null Hypothesis ,
calculating mean,
sample variance,
Standard Deviation 
# 424 :: 9/29/08

A recent article in a computer magazine suggested that the mean time to fully learn a new software program is 40 hours. A sample of 100 firsttime use. . .
1sample ttest,
Alternative Hypothesis ,
Null Hypothesis ,
test statistic,
pvalue 
# 309 :: 8/4/08

A cereal company claims that the mean weight of the cereal in its packets is 14 ounces. The weights in ounces of the cereal in a random sample of 8 of. . .
1sample ttest,
TDIST,
tscore,
tstatistic 
# 265 :: 7/6/08

An auditor reviewed 25 oral surgery insurance claims from a particular surgical office, determining that the mean outofpocket patient billing above . . .
1sample ttest 
# 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 
# 169 :: 4/25/08

Various temperature measurements are recorded at different times for a particular city. The mean of 25C is obtained for 60 temperatures on 60 differen. . .
Null Hypothesis ,
Alternative Hypothesis ,
tstatistic,
ZStatistic,
1sample ttest 