# ALU Advanced Statistics Null & Alternative Hypotheses Student GPA Worksheet

Submit your response in a MS Word document or a Pdf after inserting the results from SPSS into your document.

1. Use the SPSS data file DataSet that you originally created in your class. Suppose you are interested in evaluating whether the overall GPA of students differs according to student gender (Gender) and whether the student GPA has increased or decreased since the previous semester (ChangeinGPA).

a. Clearly state your research questions followed by their corresponding null and alternative hypotheses.

b. Test all assumptions for ANOVA and report the results. Do you need to make any data transformations?

c. Conduct the ANOVA and provide a short summary of the results? Did you find any interaction effects? Explain.

d. Restate your findings as you would report in your dissertation (in APA format).

 Modality On-ground Hybrid Online Professor Taylor 65 70 55 70 65 65 60 60 70 60 70 55 60 65 55 55 60 60 60 60 50 55 50 50 Professor Jones 50 45 30 55 60 30 80 85 30 65 65 55 70 70 35 75 70 20 75 80 45 65 60 40

2. Enter the above data into SPSS. The data shows final grades earned by 48 students in two statistics classes taught by two professors. Each professor has taught three (3) classes; on-ground, hybrid, and online. Students were randomly assigned. The goal of the study was to find whether there are meaningful differences in student grades across different modalities. After entering the data in SPSS, answer the following questions

a. Identify the independent (factors) and dependent variables.

b. State the null and alternative hypotheses.

c. Perform a factorial ANOVA in SPSS.