Refer to Exercise 8.77.

a. Determine the margin of error for the 95% confidence interval.

b. Determine the margin of error for the 90% confidence interval.

c. Compare the margins of error found in parts (a) and (b).

d. What principle is being illustrated?

Exercise 8.77

An issue with legalization of medical marijuana is “diversion,” the process in which medical marijuana prescribed for one person is given, traded, or sold to someone who is not registered for medical marijuana use. Researchers S. Sautel et al. study the issue of diversion in the article “Medical Marijuana Use Among Adolescents in Substance Abuse Treatment” The mean number of days that 120 adolescents in substance abuse treatment used medical marijuana in the last \6 months was 102.72. Assume the population standard deviation is 32 days.