HS= heavy smoker; MS= moderate smoker; NS= non-smoker 1. State the null and alte

Question

HS= heavy smoker; MS= moderate smoker; NS= non-smoker

1. State the null and alternative hypotheses, specify the distribution of the test statistic under the null hypothesis, report the value of the test statistic and the p-value of the test. State conclusion.

Two sample T hypothesis test: : Mean of WEIGHT where SMOKING = "NS" Hz : Mean of WEIGHT where SMOKING-"HS" or "MS" Hi-?2 : Difference between two means (without pooled variances) Hypothesis test results: Difference Sample Diff. Std. Err.DF Hi-H2 T-Stat P-value 769.7265 60.662461 70.708389 12.688679

Explanation / Answer

Since P-value < 0.0001< 0.05, we reject H0 at 5% level of significance.

Moreover, 95% confidence interval of difference = (648.76034, 890.69265)

Since the 95% confidence interval of difference does not include 0, so we will reject H0 at 5% level of significance.

So, the 95% confidence interval is consistent with the outcome of the test in part (1).

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