Refer to Exercise 3.45. Use a scatterplot to plot the price per roll and number of sheet...

Refer to Exercise 3.45. Use a scatterplot to plot the price per roll and number of sheets per roll.

a. Do the 24 points appear to fall on a straight line?

b. If not, is there any other relation between the two prices?

c. What factors may explain why the ratio of price per roll to number of sheets is not a constant?

REFERENCE:

3.45: The February 1998 issue of Consumer Reports provides data on the price of 24 brands of paper towels. The prices are given in both cost per roll and cost per sheet because the brands had varying numbers of sheets per roll.

a. Compute the standard deviation for both the price per roll and the price per sheet.

b. Which is more variable, price per roll or price per sheet?

c. In your comparison in part (b), should you use s or CV? Justify your answer.