Answer Happy

8.13c
a. The mean number of days that 31 adolescents in substance abuse treatment used medical marijuana in the last 6 months was 104.07. Find a 95% confidence interval for u based on that data. The 95% confidence interval is from 92.81 day(s) to 115.33 day(s). (Round to two decimal places as needed.) b. Compare the 95% confidence intervals obtained in part (a) and in the original study by drawing a graph. Choose the correct graph below. O B. O A. O C. 92 88 95% CI for μ (n=124) 100 95% CI for μ (n=124) 95% CI for μ (n=31) 102 95% CI for H (n=31) 108 116 Q c. Compare the margins of error for the two 95% confidence intervals. The margin of error for the interval obtained in part (a) is day(s), which is (Round to two decimal places as needed.) D. 92 95% CI for μ (n=124) less than the margin of error of the interval obtained in the original study. 95% CI for μ (n=31) 102 95% CI for μ (n=124) 95% CI for μ (n=31) 104 112 116 Q Q Q Q