As part of a study to determine factors that may explain differences in animal species relative to their size, the following body masses (in grams) of 50 different bird species were reported in the paper “Temperature and the Northern Distributions of Wintering Birds,” by Richard Repasky (1991).
a. Does the distribution of the body masses appear to follow a normal distribution? Provide both a graphical and a quantitative assessment.
b. Repeat part (a), with the outlier 448.0 removed.
c. Determine the sample mean and median with and without the value 448.0 in the data set.
d. Determine the sample standard deviation and MAD with and without the value 448.0 in the data set.