Given here are the birth weights (in kilograms) of male babies born to mothers on a special vitamin supplement. At the 0.05 level of significance, test the claim that the mean birth weight for all male babies of mothers given vitamins is equal to 3.39 kg, which is the mean for the population of all males. Based on the result, does the vitamin supplement appear to have an effect on birth weight?

Use the traditional approach summarized in Figure 7-4. Draw a graph showing the test statistic and critical values. In each case, assume that the population has a distribution that is approximately normal and that the sample is randomly selected.

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3.73 4.37 3.73 4.33 3.39 3.68 4.68 3.52 3.02 4.09 2.47 4.13 4.47 3.22 3.43 2.54