In a class of 28 students, the average score on a physics test was 83.4. Across all physics classes, the average on the test was 76.9 (sd = 1.6).

In a class of 28 students, the average score on a physics test was 83.4. Across all physics 

classes, the average on the test was 76.9 (sd = 1.6).

(a) Please state the null and alternative hypothesis.

(b) Are these values different from one another?

2. You have been asked to conduct a survey to compare the annual income of older adults living 

in Florida or in Minnesota. Based on this question, outline the null hypothesis, as well as the 

alternative hypothesis that you would use to test whether a preference exists.

3. In a sample of 100 older adults, 65 rated their health as “very good”, 15 rated their health as 

“good”, 15 rated their health as “poor” and 5 rated their health as “very poor”.

a) Please state the null and alternative hypothesis for this question.

b) Conduct a chi-square test to evaluate whether this distribution different than what you would 

have expected to occur normally?