Question: 2.33 More on Nintendo and laparoscopic surgery. In Exercise 1.38 (page 42), you examined the improvement in times to complete a virtual gall bladder removal

2.33 More on Nintendo and laparoscopic surgery. In Exercise 1.38 (page 42), you examined the improvement in times to complete a virtual gall bladder removal for those with and without four weeks of Nintendo WiiTM training. The most common methods for formal comparison of two groups use x and s to summarize the data. NINTENDO

(a) What kinds of distributions are best summarized by x and s? Do you think these summary measures are appropriate in this case?

(b) In the control group, one subject improved his/her time by 229 seconds. How much does removing this observation change x and s for the control group? You will need to compute x and s for the control group, both with and without the high outlier.

(c) Compute the median for the control group with and without the high outlier. What does this show about the resistance of the median and x¯ ?

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