(2) A researcher was interested in examining the number of questions asked by students during a criminal justice statistics course. She unobtrusively observes one month of lectures, and records the following number of questions asked by each of the 20 randomly sampled students: 16, 10, 12, 5, 4, 8, 6, 7, 9, 10, 7, 8, 9, 10, 13, 3, 4, 8, 9, 10 a. b. نه ن ن ف Calculate the mean for this sample. Calculate the standard deviation for this sample. Estimate the standard error of the mean. Using a 99% confidence level, what is the value of t? Construct a 99% confidence interval for the mean number of questions asked by the students.