An experiment was conducted to test the effects of alcohol. The errors were recorded in a test of visual and motor skills for a group of people who drank alcohol and another group given a placebo. The results are shown in the following table. n Sample mean Sample standard deviation Alcohol (Treatment) 22 4.18 1.87 Placebo (Control) 22 2.09 1.74 Use a 5% significance level to test the claim that there is a difference in the average number of errors of the Alcohol group and Placebo group. Assume that both populations are normal with equal variances. You may use the following Excel printout. t-Test: Two-Sample Assuming Equal Variances Treatment Placebo Mean 4.18 2.09 Variance 3.49 3.04 Observations 22 22 Pooled Variance 3.26 Hypothesized Mean Difference 0.00 df 42.00 t Stat 3.84 P(T