Homework 7
(due Tue. 9/22/09)
(1) Textbook:
2.10
2.29 (b): Explicitly show each numerical step in the calculation. Do not use Excel. Do not use the
function "r" on your calculator. (Ignore the sentence in the textbook asking you to "explain how
your value for r matches your graph ...".)
2.36
2.49: Read the narrative in the textbook exercise, and answer the following questions:
(A) Based on the information reported by the psychologist, can we necessarily conclude that the
relationship between "research productivity" and "teaching rating" is quite weak? In particular, can
we necessarily conclude that "knowing a professor is a good researcher gives little information
about whether she is a good or bad teacher"? Explain briefly.
(B) According to the quote from the newspaper's report, the correlation between "research
productivity" and "teaching rating" should be in which numerical range: (choose one)
(i) positive, not near zero.
(ii) negative, not near zero.
(iii) near zero.
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 Fall '08
 AndrewB.Nobel
 Biological clocks, Textbook exercise, Excel function CORREL

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