A medical researcher wishes to see whether the pulse rates of smokers are higher than the pulse rates of nonsmokers. A sample of 10 smokers yielded an average pulse rate of 90 with a sample standard deviation of 5. A sample of 9 nonsmokers yielded an average pulse rate of 88 with a sample standard deviation of 6. At the .05 level, can the researcher conclude that smokers have a higher pulse rate than non-smokers?

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2. A medical researcher wishes to see whether the pulse rates of smokers are higher than the pulse rates of nonsmokers. A sample of 10 smokers yielded an average pulse rate of 90 with a sample standard deviation of 5. A sample of 9 nonsmokers yielded an average pulse rate of 88 with a sample standard deviation of 6. At the 0.05 level, can the researcher conclude that smokers have a higher pulse rate than non-smokers?

Give a 99% confidence interval for the mean difference (Smoker - Nonsmoker) in pulse rate.
Transcribed Image Text:2. A medical researcher wishes to see whether the pulse rates of smokers are higher than the pulse rates of nonsmokers. A sample of 10 smokers yielded an average pulse rate of 90 with a sample standard deviation of 5. A sample of 9 nonsmokers yielded an average pulse rate of 88 with a sample standard deviation of 6. At the 0.05 level, can the researcher conclude that smokers have a higher pulse rate than non-smokers? Give a 99% confidence interval for the mean difference (Smoker - Nonsmoker) in pulse rate.
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