# Question

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?

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?

## Answer to relevant Questions

Consider the following sample data values: 18 12 7 10 15 12 6 12 14 a. Calculate the range. b. Calculate the variance. c. Calculate the standard deviation. The following list represents the number of absent students from my last nine statistics classes: 2 4 0 1 6 1 3 2 3 a. Calculate the range. b. Calculate the variance. c. Calculate the standard deviation. Consider a sample with a mean equal to 40 and a standard deviation equal to 12. Calculate the z-scores for the following values: a. 50 b. 65 c. 35 d. 10 Consider the following data values: 14 62 0 20 26 38 8 a. Calculate the mean. b. Calculate the median. c. Determine the mode. d. Describe the shape of this distribution. Consider the following data set: 71 40 45 67 5 15 43 37 13 10 Determine the percentile rank for the following values: a. 50 b. 30 c. 15Post your question

0