Question: Confidence interval for effects of marijuana use on college students. Refer to sample data used in exercise 5 and construct a 98% confidence interval for the difference between the two population means. Does the confidence interval include zero? What does the confidence interval suggest about the equality of the two population means?

Items sorted correctly by light marijuana users

\(n=64,\bar{X}=53.3,s=3.6\)

Items sorted correctly by heavy marijuana users

\(n=65,\bar{X}=51.3,s=4.5\)

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