Mark McGwire, a former Major League Baseball player who broke Roger Maris’s single season record for home runs in 1998, recently admitted to using performance enhancing steroids, primarily during the second half of his 16year career. McGwire claimed he used the steroids strictly for rehabilitation purposes and that they did not give him more power to hit home runs. The following data show the number of home runs McGwire hit during his first eight years of his career followed by the number hit during his last eight years.

1986–1993

3 49 32 33 39 22 42 9

1994–2001

9 39 52 58 70 65 32 29

For both data sets,

a. Calculate the mean.

b. Calculate the median.

c. Determine the mode.

d. Describe the shape of this distribution.

e. What conclusions can be drawn concerning Mark McGwire’s claim?