2.16 Textbook prices. Exercise 1.44 examined data on the price and number of pages for a random sample of 30 textbooks from the Cal Poly campus bookstore. The data are stored in the file TextPrices and appear in Table 1.5.

Perform a significance test to address the students' question of whether the number of pages is a useful predictor of a textbook's price. Report the hypotheses, test statistic, and P-value, along with your conclusion.

Find and interpret a 95% confidence interval for the slope of this regression model. Also explain what this slope coefficient means in the context of these data.

In [9]: print (data. bookprices) Pages Price 600 95.00 91 19.95 200 51.50 400 128.50 NO UAWNY 521 96.00 315 48.50 800 146.75 800 92. 00 600 19.50 10 488 85 . 50 11 150 16.95 12 140 9. 95 13 194 5. 95 14 425 58. 75 15 51 6.50 16 930 70.75 17 57 4. 25 18 900 115.25 19 746 158. 00 20 104 6.50 21 696 130.50 22 294 7.00 23 526 41 . 25 24 1060 169.75 25 502 71.25 26 590 82. 25 27 336 12.95 28 816 127. 00 29 356 41.50 30 248 31.00