Mathematics, 22.09.2020 20:01 itzmelanie1

A researcher compares the effectiveness of two different instructional methods for teaching physiology. A sample of 178 students using Method 1 produces a testing average of 54.4. A sample of 226 students using Method 2 produces a testing average of 74.5. Assume the standard deviation is known to be 18.58 for Method 1 and 9.52 for Method 2. Determine the 90% confidence interval for the true difference between testing averages for students using Method 1 and students using Method 2. Required:
a. Find the critical value that should be used in constructing the confidence interval.
b. Construct the 95% confidence interval. Round your answers to one decimal place.

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