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Showing of 28 Questions
No. & Date AskedQuestion
# 949 :: 4/29/12
Question 949 has been Answered
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. . .

1-sample t-test

# 920 :: 1/13/12
Question 920 has been Answered
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 . . .

1-sample t-test

# 915 :: 12/6/11
Question 915 has been Answered
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. . .

1-sample t-test, Confidence Intervals

# 914 :: 12/6/11
Question 914 has been Answered
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. . .

1-sample t-test, Confidence Intervals

# 908 :: 12/3/11
Question 908 has been Answered
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. . .

1-sample t-test

# 907 :: 12/3/11
Question 907 has been Answered
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. . .

1-sample t-test

# 906 :: 12/3/11
Question 906 has been Answered
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. . .

1-sample t-test

# 895 :: 7/19/11
Question 895 has been Answered
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. . .

1-sample t-test, test statistic

# 873 :: 1/3/11
Question 873 has been Answered
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. . .

1-sample t-test

# 846 :: 3/2/10
Question 846 has been Answered
A recent article in The Wall Street Journal reported that the 30-year mortgage rate is now less than 6 percent. A sample of eight small banks in the . . .

1-sample t-test

# 845 :: 3/2/10
Question 845 has been Answered
Dole Pineapple, Inc., is concerned that the 16-ounce can of sliced pineapple is being overfilled. Assume the standard deviation of the process is .03. . .

1-sample t-test, 1-sample Z-test

# 844 :: 3/2/10
Question 844 has been Answered
A new weight-watching company, Weight Reducers International, advertises that those who join will lose, on the average, 10 pounds the first two weeks. . .

1-sample t-test, 1-sample Z-test

# 838 :: 2/9/10
Question 838 has been Answered
using the full 5-step 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. . .

1-sample t-test

# 833 :: 12/9/09
Question 833 has been Answered
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, 1-sample t-test

# 744 :: 6/6/09
Question 744 has been Answered
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. . .

1-sample t-test

# 729 :: 5/23/09
Question 729 has been Answered
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. . .

1-sample t-test

# 638 :: 2/23/09
Question 638 has been Answered
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. . .

1-sample t-test

# 635 :: 2/22/09
Question 635 has been Answered
Linemarking for parking bays shall be determined by the retroreflectivity performance of glass beads in the linemarking. The linemarking average level. . .

1-sample t-test, Confidence Intervals

# 616 :: 2/7/09
Question 616 has been Answered
Evolutionary theories often emphasize that humans have adapted to their physical environment. One such theory hypothesizes that people should spontane. . .

1-sample t-test

# 574 :: 1/14/09
Question 574 has been Answered
Assume you have the following data: Ho mu = 200, s = 30, n = 64, and x-bar = 218. Conduct a hypothesis test at the .05 significance level. Assum. . .

1-sample t-test, 1-sample Z-test

# 569 :: 12/21/08
Question 569 has been Answered
Faced with rising fax costs, a firm issued a guideline that transmissions of 10 pages or more should be sent by 2-day mail instead. Exceptions are all. . .

1-sample t-test, TDIST

# 563 :: 12/19/08
Question 563 has been Answered
A vinyl siding company claims that the mean time to install siding on a medium-size house is at most 20 hours with a standard deviation of 3.7 hours. . . .

1-sample Z-test, 1-sample t-test

# 540 :: 12/9/08
Question 540 has been Answered
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. . .

1-sample t-test, 1-tailed test, Null Hypothesis , calculating mean, sample variance, Standard Deviation

# 424 :: 9/29/08
Question 424 has been Answered
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 first-time use. . .

1-sample t-test, Alternative Hypothesis , Null Hypothesis , test statistic, p-value

# 309 :: 8/4/08
Question 309 has been Answered
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. . .

1-sample t-test, TDIST, t-score, t-statistic

# 265 :: 7/6/08
Question 265 has been Answered
An auditor reviewed 25 oral surgery insurance claims from a particular surgical office, determining that the mean out-of-pocket patient billing above . . .

1-sample t-test

# 214 :: 6/2/08
Question 214 has been Answered
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. . .

1-sample t-test, Confidence Intervals, Sample Size

# 169 :: 4/25/08
Question 169 has been Answered
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 , t-statistic, Z-Statistic, 1-sample t-test