Altman and Bland report the survival times for patients with active hepatitis, half treated with prednisone and half receiving no treatment. The survival times (in months) (Exercise 1.25 and EX0125) 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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