ACTIVITY

Eight pairs of slow learners with similar reading IQs are found, one member of each pair is randomly assigned to the standard teaching method while the other is assigned to the new method. The data on the students readinfg test scores are given in the following table.

a. Form a 95% confidence interval for the mean difference (New Method - Standard Method) in reading test scores.

• Step 1: Make sure that "Input" menu option is selected.
• Step 2: Click on "Col_1" and replace it with "New Method".
• Step 3: Enter the data for the New Method.
• Step 4: Click on "Col_2" and replace it with "Standard Method".
• Step 5: Enter the data for the Standard Method.
• Step 6: Select the "t test" from menu options.

The output will include: Sample size, Mean difference (New Method - Standard Method), and Standard deviation of the difference followed by 95% confidence interval for the population mean difference.

b. Find a 99% confidence interval by following the steps given below:

• Step 1: Make sure that "Input" menu option is selected.
• Step 2: Click on "Col_1" and replace it with "New Method".
• Step 3: Enter the data for the New Method.
• Step 4: Click on "Col_2" and replace it with "Standard Method".
• Step 5: Enter the data for the Standard Method.
• Step 6: Select the "t test" from menu options.
• Step 7: Click on the "Options" button on the upper right hand side of the window.
• Step 8: Change only Alpha from 5.0 to 1.0.
• Step 9: Click on the "OK" button.

The output will include: Sample size, Mean difference (New Method - Standard Method), and Standard deviation of the difference followed by 99% confidence interval for the population mean difference.

c. By using your answers to a and b, what can you say about the effectiveness of the new method?