Chapter 15, Problem 21P

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8th Edition

Frederick J Gravetter + 1 other

ISBN: 9781133956570

Textbook Problem

Research indicates that people who volunteer to participate in research studies tend to have higher intelligence than nonvolunteers. To test this phenomenon, a researcher obtains a sample of 200 high-school students. The students are given a description of a psychological research study and asked whether they would volunteer to participate. The researcher also obtains an IQ score for each student and classifies the students into high, medium, and low IQ groups. Do the following data indicate a significant relationship between IQ and volunteering? Test at the .05 level of significance.

To determine

**To check:** Whether there is significant relationship between the IQ and volunteering for the given question.

Explanation

**Given info:**

A sample of 200 students were involved in a study based on “the IQ score of a student and their willingness to volunteer”. Use

**Calculations:**

Step 1: Null Hypothesis and Alternate Hypothesis are:

Step 2: For the given sample, degrees of freedom equals:

With

Step 3:

The formula to calculate expected frequency is:

Substitute

For the category “volunteer”, the expected frequencies are:

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