94. The accompanying observations are precipitation values dur- ing March over a 30-year period in Minneapolis-St. Paul. .77 1.20 1.74 .47 3.09 3.00 1.62 2.81 2.48 1.31 1.87 .96 .81 1.43 1.51 .32 1.18 1.89 1.20 3.37 2.10 .59 1.35 .90 1.95 2.20 .52 .81 4.75 2.05

a. Construct and interpret a normal probability plot for this data set.

b. Calculate the square root of each value and then con- struct a normal probability plot based on this trans- formed data. Does it seem plausible that the square root of precipitation is normally distributed?

c. Repeat part

(b) after transforming by cube roots.