For questions 7-12, refer to the following information: A clinical trial was conducted to test the effectiveness of the drug zopiclone for treating insomnia among older adults. Before treatment with zopiclone, 16 subjects had a mean wake time of 102.8 minutes. After treatment with zopiclone, the 16 subjects had a mean wake time of 98.9 min and a standard deviation of 42.3 min (based on data from \"Cognitive Behavioral Therapy vs Zopiclone for Treatment of Chronic Primary Insomnia in Older Adults,\" by Siversten et al., Journal of the American Medical Association, Vol 295, No. 24). Assume that the 16 sample values appear to be from a normally distributed population, using a signicance level of 0.05, test the claim that after treatment with zopiclone, people have a mean wake time of less than 102.8 min. Does zopiclone appear to be effective? 7. What is the null hypothesis Ho? (1 point) a. x 2 102.8 b. u 2 102.8 . x