14. The null and alternate hypotheses are: H0: m1 # m2 H1: m1 . m2 A random sample of 20 items from the first population showed a mean of 100 and a standard deviation of 15. A sample of 16 items for the second population showed a mean of 94 and a standard deviation of 8. Use the .05 significant level. 41. An investigation of the effectiveness of an antibacterial soap in reducing operating room contamination resulted in the accompanying table. The new soap was tested in a sample of eight operating rooms in the greater Seattle area during the last year. The following table reports A Before After B 6.6 6.8 Operating Room C D E 6.5 9 10.3 2.4 7.4 8.5 F 11.2 8.1 G 8.1 6.1 H 6.3 3.4 At the .05 significance level, can we conclude the contamination measurements are lower after use of the new soap? 11.6 2 ntamination