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Chapter 9: Q. 63 (page 587)

Attitudes The Survey of Study Habits and Attitudes (SSHA) is a psychological test that measures students鈥� attitudes toward school and study habits. Scores range from 0to200. The mean score for U.S. college students is about 115. A teacher suspects that

older students have better attitudes toward school. She gives the SSHA to an SRS of 45of the over 1000students at her college who are at least 30years of age. Check the conditions for carrying out a significance test of the teacher鈥檚 suspicion.

Short Answer

Expert verified

The teacher selected an SRS of 45students. 10%:45is less than 10%of the population size of 1000. Normal/Large Sample: n=45鈮�30

Step by step solution

01

Given information

Scores range from 0to200.

The mean score for U.S. college students is about 115.

A teacher suspects that older students have better attitudes toward school.

She gives the SSHA to an SRS of45of the over 1000students at her college who are at least 30years of age.

02

Explanation

The teacher wants to perform a test at the 伪=0.05 significance level of

HO:渭=115Ha:渭>115

where 渭=the mean SSHA score in the population of students at her college who are at least 30years old. Check if the conditions for performing the test are met.

The teacher selected an SRS of 45students.

10%:45is less than 10%of the population size of 1000.

Normal/Large Sample:n=45>30

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