2- In a random sample of 8 students, the number of hours they study for the stat class per week is: 12, 8, 4.5, 10, 5, 7.5, 4, and 7. a. Test the null hypothesis if the population average number of...

Extracted text: 2- In a random sample of 8 students, the number of hours they study for the stat class per week is: 12, 8, 4.5, 10, 5, 7.5, 4, and 7. a. Test the null hypothesis if the population average number of hours studied is at most 5.50 hours, use a=0.05. Calculate (approximate) p-value b. Test if population variance (o?) is equal to 5, use a=0.10. c. What assumptions are necessary for the validity of your results in parts a and b?