Question 11 14 pts A Facebook product manager wants to know if the average number of messages sent by people under age 30 is different from the average number of messages sent by people 30 years old or older. The manager collects data from 40 Facebook users under age 30, and 40 Facebook users 30 years old or older. A: Choose the hypothesis test that she should use to evaluate if there is a difference in the number of messages sent based on the data collected. Two-sample t-test for means, V B: She calculates a 95% condence interval for the difference in number of messages based on the samples for each age group. The condence interval is (18 texts, 42 texts). Is there a statistically signicant difference in number of messages sent? J [ Select ] Cannot tell if the difference is statistically significant based on this information. Yes, there is a statistically significant difference. No, there is not a statistically significant difference. D: If both groups were half the size, with the same summary statistics, what would you expect to see in the condence interval? [ Select] v