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13) A medical researcher wishes to see whether the pulse rates of smokers are higher than the pulse rates of nonsmokers. Samples of 100 smokers and 100 nonsmokers are selected. The results are shown here. Can the researcher conclude, at (confidence interval) =0.05 that smokers have higher pulse rates than nonsmokers? Smokers - X1 = 90 S1= 5 N1=100 Nonsmokers - X2= 88 S2 = 6 N2= 100 State the claim: Ho: There is no difference in the pulse rates of smokers and non smokers. H1: smokers have higher pulse rate than non smokers Test Statistic: Z = ( 90 ??? 88)/ ((25/100+36/100) Z = 2 / 0.7810 Z = 2.5608 Decision: the critical value at 0.05 level is 1.645 Since the calculated value is greater than the table value we reject HO. Conclusion: Smokers have higher pulse rate than non smokers.

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