Question 16 of 20 : Select the best answer for the question. 16. In a paired difference experiment, you get the following results: no = 38 x, =92 X2 =95.5 d = -3.5 $2 =21 Find a 90% confidence interval for the mean difference Hd = H1 - H2 O A. -3.3 + 1.920 O B. -3.5 + 1.368 O C. -3.9 + 1.209 O D. -3.5 + 1.223Question 15 of 20 : Select the best answer for the question. 15. In testing a population variance or constructing a confidence interval for the population variance, an essential assumption is that O A. the population is uniformly distributed 0 B. the sample size is at least 100. O C. the population is normally distributed. 0 D. the expected frequencies equal or exceed 5 Question 14 of 20 : Select the best answer for the question. 14. Find the slope of the line that passes through the points (1,1) and (5,5) O A. -1 O B. 1/2 O C. O O D. 1