Refer to the data in the previous exercise.
a. State the null and alternative hypotheses for a test of possible association between pages and price.
b. The null distribution for Exercise 10.4.7 was created to test the hypotheses stated in the previous question using slope as the statistic.

i. Based on information shown in the null distribution, how many standard deviations is our observed statistic above the mean of the null distribution? (That is, what is the standardized statistic?)
ii. Based on your standardized statistic, do you have strong evidence of an association between number of pages and price of textbooks? Explain.

Data from previous exercise

A random sample of 15 textbooks in a campus bookstore was selected. Two of the variables recorded were the price of the book (in dollars) and the number of pages it contained. The data are displayed in the following scatterplot. Summarize the form, direction and strength of association of the scatterplot for Exercise 10.4.6.

Transcribed Image Text:

Mean = -0.000 600 SD = 0.054 %3D Total = 5000 %3D 500 400 300 200 100 -0.300 -0.200 -0.100 0.100 0.200 Shuffled slopes Count 162 122 82 42 2 300 600 900 Pages Price