An instructor would like to compare the test one grades in the 10:00 statistics class to the grades in the 11:00 class. The instructor takes a sample of 10 test one grades from each of the classes. This is an example of
A grocery store manager would like to compare prices as her store to the prices at a competitor. She chooses a sample of 15 items that are sold at both stores and compares the prices. This is an example of
. A testing company is checking to see whether there is any significant difference in the coverage of two different brands of paint for a hardware store chain. The results are summarized below.
Amazon Paint Coverup Paint
Sample mean coverage (in square feet) 305 295
Population standard deviation 20 25
Sample Size 40 45
A point estimate of the difference between the population means is
. A testing company is checking to see whether there is any significant difference in the coverage of two different brands of paint for a hardware store chain. The results are summarized below.
Amazon Paint Coverup Paint
Sample mean coverage (in square feet) 305 295
Population standard deviation 20 25
Sample Size 40 45
A point estimate of the standard deviation of the difference between the sample means is
A testing company is checking to see whether there is any significant difference in the coverage of two different brands of paint for a hardware store chain. The results are summarized below.
Amazon Paint Coverup Paint
Sample mean coverage (in square feet) 305 295
Population standard deviation 20 25
Sample Size 40 45
The form of the sampling distribution of the difference between the sample means is the
A testing company is checking to see whether there is any significant difference in the coverage of two different brands of paint for a hardware store chain. The results are summarized below.
Amazon Paint Coverup Paint
Sample mean coverage (in square feet) 305 295
Population standard deviation 20 25
Sample Size 40 45
If a two-tailed test is used, the p-value is
A testing company is checking to see whether there is any significant difference in the coverage of two different brands of paint for a hardware store chain. The results are summarized below.
Amazon Paint Coverup Paint
Sample mean coverage (in square feet) 305 295
Population standard deviation 20 25
Sample Size 40 45
If a two-tailed test is used with a .05 level of significance, the decision is
An instructor wanted to compare how students did on their first test compared to their second test. A sample of seven students was chosen and their first and second test scores were recorded.
Student Test One Test Two
1 72 75
2 68 66
3 55 60
4 58 64
5 52 55
6 55 57
7 64 64
This is an example of
An instructor wanted to compare how students did on their first test compared to their second test. A sample of seven students was chosen and their first and second test scores were recorded.
Student Test One Test Two
1 72 75
2 68 66
3 55 60
4 58 64
5 52 55
6 55 57
7 64 64
The instructor's hypothesis is that there is no difference between the average test scores. The test is done with a = .05. The critical value is.
An instructor wanted to compare how students did on their first test compared to their second test. A sample of seven students was chosen and their first and second test scores were recorded.
Student Test One Test Two
1 72 75
2 68 66
3 55 60
4 58 64
5 52 55
6 55 57
7 64 64
The instructor's hypothesis is that there is no difference between the average test scores. The test is done with a = .05. An estimate of the population mean difference between the test scores is
An instructor wanted to compare how students did on their first test compared to their second test. A sample of seven students was chosen and their first and second test scores were recorded.
Student Test One Test Two
1 72 75
2 68 66
3 55 60
4 58 64
5 52 55
6 55 57
7 64 64
The instructor's hypothesis is that there is no difference between the average test scores. The test is done with a = .05. The standard deviation of the difference between the test scores is
. An instructor wanted to compare how students did on their first test compared to their second test. A sample of seven students was chosen and their first and second test scores were recorded.
Student Test One Test Two
1 72 75
2 68 66
3 55 60
4 58 64
5 52 55
6 55 57
7 64 64
The instructor's hypothesis is that there is no difference between the average test scores. The appropriate test statistic follows the following distribution:
An instructor wanted to compare how students did on their first test compared to their second test. A sample of seven students was chosen and their first and second test scores were recorded.
Student Test One Test Two
1 72 75
2 68 66
3 55 60
4 58 64
5 52 55
6 55 57
7 64 64
The instructor's hypothesis is that there is no difference between the average test scores. The test is done with = .05. The decision is
A survey firm conducts door-to-door surveys on a variety of issues. Some individuals cooperate with the interviewer and complete the interview questionnaire and others do not. The following data are available.
Respondents Sample Size Number Cooperating
Men 200 110
Women 300 210
Give a point estimate of the difference between the population proportions for women and men.
A survey firm conducts door-to-door surveys on a variety of issues. Some individuals cooperate with the interviewer and complete the interview questionnaire and others do not. The following data are available.
Respondents Sample Size Number Cooperating
Men 200 110
Women 300 210
Give a 95% confidence interval estimate of the difference between the population proportions for women and men.