1. An experiment was conducted to test the effects of alcohol. Researchers measured the breath levels for a treatment group of people who drank ethanol and another group given placebo. The results are given in the accompanying table. Use a 0.05 significance level to test the claim that the two sample groups come from populations with the same mean.

a)Treatment group: n₁ =22, , s = 0.015

b)Placebo group: n₂ =22, , s = 0.000

1. Listed below are the body temperature (in ^o F) of subjects measured at 8.00 AM and 12.00AM. Use a 0.05 significance level to check the change in body temperature measured at both times.

a)8.00 AM:97.0,96.2,97.6,96.4,97.8,99.2

b)12.00 AM:98.0,98.6,98.8,98.0,98.6,97.6