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 below. Smokers Nonsmokers X, = 90 X2 = 88 S1 = 5 ni = 100 S2 = 6 n2 = 100 a) Find a 99% confidence interval for the true mean difference in smokers pulse rates and nonsmokers pulse rates. b) At a = 0.05, can we conclude that the pulse rates of smokers is higher than the pulse rates on nonsmokers?

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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 below.
Smokers
Nonsmokers
X = 90
S1 = 5
nj = 100
X2
= 88
%3D
S2 = 6
n2 = 100
a) Find a 99% confidence interval for the true mean difference in smokers pulse rates and nonsmokers
pulse rates.
b) At a = 0.05, can we conclude that the pulse rates of smokers is higher than the pulse rates on
nonsmokers?
Transcribed Image Text: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 below. Smokers Nonsmokers X = 90 S1 = 5 nj = 100 X2 = 88 %3D S2 = 6 n2 = 100 a) Find a 99% confidence interval for the true mean difference in smokers pulse rates and nonsmokers pulse rates. b) At a = 0.05, can we conclude that the pulse rates of smokers is higher than the pulse rates on nonsmokers?
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