1. Use a 0.05 significance level to test the claim that the population of heavy marijuana users has a standard deviation different from that of light users.

Items sorted correctly by light marijuana users: n=64, x=53.5, s= 3.6

Items sorted correctly by heavy marijuana users: n=65, x=51.3, 4.5

Solution: We need to test the null hypothesis

We have the following results:

We observe that the p-value is 0.07, which is greater than the significance level. That means that we can not reject the null hypothesis. In other words, we don’t have enough evidence to support the claim that the population of heavy marijuana users has a standard deviation different from that of light users.

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