Simple Regression Model and Harry Potter Book
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The students in a modern popular fiction class are complaining that every time Rowling
writes another book, it gets longer. Their statistics teacher challenges them to show that their
complaints are accurate. Using the Harry Potter data below and a 0.05 level of significance,
perform a correlation/regression analysis between the book number and the number of pages.
Include a scatterplot and answer the following questions:
a. What is the hypothesis?
b. What is the null hypothesis?
c. Is there a correlation between the number of the book and the number of pages in the
book? What type of correlation is it?
d. What is the R2 value? What does this mean?
e. If the regression formula holds true and Rowling decided to write book 9, how many pages would it contain?
JK Rowling (Harry Potter)
Book Pages
1 309
2 341
3 435
4 754
5 869
6 652
7 739
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