Assignment

An educational psychologist is interested in seeing if Return To College (RTC) students-that is, students who have not attended school for more than 4 years

in order to work or raise a family-are more motivated to achieve higher grades than students who have not taken a break in their education. She knows that

the distribution of grade point averages (GPAs) for students at her college who have not interrupted their education is normally distributed with a mean of

2.90 and a standard deviation of 0.89. She collects the following sample of GPAs for 10 RTC students. Use the data in Table 9.6 to answer the following

questions./nGPA for RTC Students

GPA

3.70

2.60

3.10

3.00

3.10

3.80

2.60

3.40

3.00

2.80

Use the data to answer the following questions:

A. Find the mean GPA for the RTC students in the sample.

B. Determine the null and alternative hypotheses in symbols AND in words.

C. **Decide if the GPAs earned by RTC students are significantly higher than the population.