Question 4

The following is the (edited) output for the test:

Paired T-Test and CI Sample N Mean StDev SE Mean Marijuana Use 10 70.6 23. 4 7.4 No Marijuana Use 10 78 .0 17.4 5.5 Difference 10 -0. 43 11.83 3.74 954 lower bound for mean difference: -7.29 T-Test of mean difference = 0 (vs > 0) : T-Value = -0.11 P-Value = 0.544