Countdown: Days:-0 Time:-04:35:04 Child Health and Development Studies (CHDS) has been collecting Select one answer. data about expectant mothers in Oakland, CA since 1959. One of the | 10 points measurements taken by CHDS is the weight increase (in pounds) for expectant mothers in the second trimester. In a fictitious study, suppose that CHDS finds the average weight increase in the second trimester is 14 pounds. Suppose also that, in 2015, a random sample of 40 expectant mothers have mean weight increase of 16 pounds in the second trimester, with a standard deviation of 6 pounds. At the 5% significance level, we can conduct a one-sided T-test to see if the mean weight increase in 2015 is greater than 14 pounds. Statistical software tells us that the p-value = 0.021. Which of the following is the most appropriate conclusion? A. . There is a 2.1% chance that a random sample of 40 expectant mothers will have a mean weight increase of 16 pounds or greater if the mean second trimester weight gain for all expectant mothers is 14 pounds. B. . There is a 2.1% chance that mean second trimester weight gain for all expectant mothers is 14 pounds in 2015- C. . There is a 2.1% chance that mean second trimester weight gain for all expectant mothers is 16 pounds in 2015. D. . There is 2.1% chance that the population of expectant mothers will have a mean weight increase of 16 pounds or greater in 2015 if the mean second trimester weight gain for all expectant mothers was 14 pounds in 1959. Question 7 A criminal investigator conducts a study on the accuracy of Select one answer. fingerprint matching and recruits a random sample of 35 people to 10 points participate. Since this is a random sample of people, we don't expect the fingerprints to match the comparison print. In the general population, a score of 80 indicates no match. Scores greater than 80 indicate a match. If the mean score suggests a match, then the fingerprint matching criteria are not accurate. The null hypothesis is that the mean match score is 80. The alternative hypothesis is that the mean match score is greater than 80. The criminal investigator chooses a 5% level of significance. She performs the experiment and analyzes the results. She uses a t-test for a mean and obtains a p-value of 0.04. Which of the following is a reasonable interpretation of her results? A. . This suggests that there is evidence that the mean match score is greater than 80. This suggests that the fingerprint matching criteria are not accurate. B. If there is a treatment effect, the sample size was too small to detect it. This suggests that we need a larger sample to determine if the fingerprint matching criteria are not accurate. C. She cannot reject the null hypothesis. This suggests that the fingerprint matching criteria could be accurate. D. . This suggests that there is evidence that the mean match score is equal to Bo. This suggests that the fingerprint matching criteria is accurate. Question 8