In a study, the mean number of days that 160 adolescents in substance abuse treatment used medical marijuana in the last 6 months was 112.52. Assuming the population standard deviation is 28 days, a 90% confidence interval for the mean number of days, u. of medical marijuana use in the last 6 months of all adolescents in substance abuse treatment is from 108.88 days to 116.16 days; this interval's margin of error is 3.64 days. Complete parts (a) through (d) below. Click here to view page 1 of the table of areas under the standard normal curve. Click here to view page 2 of the table of areas under the standard normal curve. a. The mean number of days that 40 adolescents in substance abuse treatment used medical marijuana in the last 6 months was 109.17. Find a 90% confidence interval for u based on that data. The 90% confidence interval is fromday(s) to day(s). (Round to two decimal places as needed.)

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