A researcher compares the effectiveness of two different instructional methods for teaching pharmacology. A sample of 51 students using Method 1 produces a testing average of 81.6. A sample of 76 students using Method 2 produces a testing average of 76.4. Assume that the population standard deviation for Method 1 is 12.24, while the population standard deviation for Method 2 is 11.19. Determine the 90% confidence interval for the true difference between testing averages for students using Method 1 and students using Method 2. Step 1 of 3: Find the point estimate for the true difference between the population means.
Step 2 of 3: Calculate the margin of error of a confidence
interval for the difference between the two population means. Round
your answer to six decimal places.
Step 3 of 3: Construct the 90% confidence interval. Round your answers to one decimal place.
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