- 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*.

**GO TO NEXT PROBLEM >>**