Question 15 (CO 4) In a situation where the standard deviation was increased from 3.1 to 5.8, what would be the impact on the confidence interval? It would become narrower due to the increased standard deviation It would become wider due to the increased standard deviation It would remain the same as standard deviation does not impact confidence intervals It would become narrower with more values Question 16 2 pts 2 pts (CO 4) In a random sample of eighteen people, the mean time at lunch was 35.6 minutes with a standard deviation of 8.2 minutes. Assuming the data are normally distributed, what would be the 85% confidence interval? (32.82, 38.38) (33.12, 38.08) (32.69, 38.51) (33.02, 38.18)