answer all questions with explanation

4. Now let's look the data again. Since the grade was rounded, the distribution assumption for ANOVA might not be satisfied. Instead of doing an ANOVA, we could conduct a Chi-square test for the same purpose. For example, the grade is treated as category such as 90=A, 80-B, and et al. Follow the steps of hypothesis testing to conduct the Chi-square test. a) State the null and research hypotheses for this study. b) State the assumption(s) for this test. c) Calculate the test statistic. d) Assuming alpha equals to .05, what are the degrees of freedom and the critical value? e) Based on the calculated statistic and the critical value from d) and e), what is your conclusion