It is believed that the effects of smoking differ depending on race. The followi

Question

It is believed that the effects of smoking differ depending on race. The following table gives the results of a statistical study for this question. Do the data indicate that African Americans are more likely to develop lung cancer due to smoking? Use alpha = 0.05. A supermarket chain is considering two sources A and B for the purchase of 50-pound bags of onions. The following table gives the results of a study. Test at alpha = 0.05 whether there is a difference in the mean weights. In order to compare the mean Hemoglobin (Hb) levels of well-nourished and undernourished groups of children, random samples from each of these groups yielded the following summary.

Explanation / Answer

6.5.4

Usinig minita:

Chi-Square Test for Association: C5, c5

Rows: C5   Columns: c5

                                                   number
                                                  of lung
                     number in    average number   cancer
                     the study odf cigarate/day    cases All

Whites                     400                15       78 493
                        400.05             17.65    75.30

African Americans          280                15       50 345
                        279.95             12.35    52.70

All                        680                30      128 838

Cell Contents:      Count
                    Expected count

Pearson Chi-Square = 1.200, DF = 2, P-Value = 0.549
Likelihood Ratio Chi-Square = 1.187, DF = 2, P-Value = 0.553

P-value >0.55 so we do not reject null hypothesis.

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