Question

In: Statistics and Probability

A researcher compares the effectiveness of two different instructional methods for teaching physiology. A sample of...

A researcher compares the effectiveness of two different instructional methods for teaching physiology. A sample of 157 students using Method 1 produces a testing average of 65.9. A sample of 129 students using Method 2 produces a testing average of 80. Assume the standard deviation is known to be 12.47 for Method 1 and 12.84 for Method 2. Determine the 95% confidence interval for the true difference between testing averages for students using Method 1 and students using Method 2.

Step 1 of 2:

Find the critical value that should be used in constructing the confidence interval.

Solutions

Expert Solution

  • By calculation using formula

  • Using Minitab software

Steps-

Stat>Basic statistics>2 sample t>summarised data>enter values>ok

Output-

--------------------

Thank you...!

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