23. Survival Times Altman and Bland report the survival times for patients with active hepatitis, half treated with prednisone and half receiving no treatment.12 The survival times (in months) are adapted from their data for those treated with prednisone.

a. Can you tell by looking at the data whether it is roughly symmetric? Or is it skewed?

b. Calculate the mean and the median. Use these measures to decide whether or not the data are symmetric or skewed.

c. Draw a box plot to describe the data. Explain why the box plot confirms your conclusions in part b.

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8 87 127 147 11 93 133 148 52 97 139 157 57 109 142 162 65 120 144 165