Chapter 11, Problem 3RE

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8th Edition

Frederick J Gravetter + 1 other

ISBN: 9781133956570

Textbook Problem

a. A repeated-measures study with a sample of *n* = 9 participants produces a mean difference of *M* = 3 with a standard deviation of *s* = 6. Use a two-tailed hypothesis test with
_{D} = 0.

b. Now assume that the sample mean difference is *M _{D} =* 12, and once again visualize the sample distribution. Use a two-tailed hypothesis test with

c. Explain how the size of the sample mean difference influences the likelihood of finding a significant mean difference.

**a.**

To determine

If the result significant enough to conclude that Ritalin improves attention span.

Explanation

**Given info:**

Sample of

**Calculation:**

*Stating the testing hypotheses:*

*Null Hypothesis:*

*Alternate Hypothesis:*

Degrees of freedom is:

With

The formula for standard error difference is

**b.**

To determine

The 80% Confidence interval.

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