1. Using the hardness data from the odor data set odor .txt, do the following.
(a) Make a normal probability plot of the data.
(b) Do the data appear to be normally distributed? Explain.
2. Use the web site data webvisit .txt to do the following.
(a) Make a normal probability plot for the entire data set.
(b) Make normal probability plots for the two apparent groups in the data.
(c) Calculate the mean and standard deviation for each group.
(d) Assuming the group with the larger values is normally distributed, use your calculated mean and standard deviation to estimate the propor tion of days that have more than 15,300 visits.
(e) Write a paragraph describing this set of data and the conclusions you have drawn from it.