3. Now you will obtain numerical summaries for the two groups. (a) Use the Descriptive Statistics feature of StatCrunch to compute the mean, median, standard deviation, and variance for the distribution of the mean sway range in the forward-backward plane for the elderly and the young subjects. Moreover, obtain the summary statistics for the mean sway range in the side-to- side plane for the two groups. Paste the numerical summaries into your report. (b) Use the summaries in part (a) to compare the sway range for the backward-forward and side-toside planes. What do you conclude?.