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Pages Price (H) 1 104 32.95 (H) 2 188 24.95 (H)3 220 49.5 (H)4 264 79.95 (P)5 336 4.50 (H)6 342 49.95 (P)7 378 4.95
Pages Price (H) 1 104 32.95 (H) 2 188 24.95 (H)3 220 49.5 (H)4 264 79.95 (P)5 336 4.50 (H)6 342 49.95 (P)7 378 4.95 (P)8 385 5.99 (P)9 417 4.95 (H) 10 417 39.95 (P) 11 436 5.95 (H) 12 458 60.00 (H) 13 466 49.95 (P)14 469 5.99 (P)15 585 5.95 The table gives the number of pages in a book and its price. The correlation for the above data set is -0.312. What would this lead you to conclude O The price of a book tends to increase as the number of pages increase O The price of a book tends to decrease as the number of pages increase This is possibly a false correlation. It goes against common sense. Make a rough scatter plot of the above data. What would you now conclude It confirms that the negative correlation is meaningful. There are two subgroups and in each subgroup price tends to decrease with number of pages. This correlation is false. There is a lurking variable (possibly hard cover and soft cover) which distorts the correlation. In each subgroup the price tends to increase with number of pages. It confirms that the negative correlation is meaningful and price tends to decrease with number of pages. It suggests that a mistake was made in computing correlation
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