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Chapter 9: Q.3 (page 546)

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 0 to 200. 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 45

of the over 1000 students at her college who are at least 30 years of age.

Short Answer

Expert verified

Population mean for the student is115as per null hypothesis and it is more than115as per alternative hypothesis.

Step by step solution

01

introduction

Given,

Scores range from 0-200.

The mean score for U.S. college students is about115.

Calculating the null and alternative hypotheses.

02

explanation

The mean score for U.S. college students is115

Mean population value is115as per the null hypotheses

鈬�H0:渭=115

Mean population value is greater than 115as per the alternative hypotheses

鈬�Ha:渭>115

The population mean for the student is 115 as per null hypothesis and it is more than115 as per alternative hypothesis.

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(c) Do these data give convincing evidence to support the researchers鈥� suspicion? Carry out a test pg 571to help you answer this question.

Stating hypotheses State the appropriate null and alternative hypotheses in each of the following cases.

(a) The average height of 18-year-old American women is 64.2inches. You wonder whether the mean height of this year's female graduates from a large local high school (over 3000students) differs from the national average. You measure an SRS of 48female graduates and find that X=63.1inches.

(b) Mr. Starnes believes that less than 75%of the students at his school completed their math homework last night. The math teachers inspect the homework assignments from a random sample of students at the school to help Mr. Starnes test his claim.

- Check conditions for carrying out a test about a population proportion or mean.

- Interpret P-values in context.

You are testing HO:渭=10H伪:渭<10against based on an SRS of 20observations from a Normal population. The tstatistic is . t=-2.25The P-value

(a) falls between 0.01and0.02

(b) falls between0.02and0.04

(c) falls between0.04and0.05

(d) falls between .05and0.25.

(c) is greater than0.25.

Simon reads a newspaper report claiming that 12% of all adults in the United States are left-handed. He wonders if 12% of the students at his large public high school are left-handed. Simon chooses an SRS of 100 students and records whether each student is right- or left-handed.
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