Homework 5
due in class, Tuesday February 22
Include only the most relevant parts of output from R (or whatever
package you are using). Do not include a transcript of your entire
session, just cut and paste (electronically or literally) the
necessary parts. Please staple your assignment if it is more than one
page.
Required problems:
1) 10.91 (p. 376) just compare (i.e. test for a difference) price
between domestic and imports - note that the first numerical
column is price, and the last column is 1 for a domestic and 0 for
an import
2) 11.5 (p. 401)
3) 13.6 (p. 493) Use a computer package (preferably R) for part (b).
4) 13.17 (p. 498)
5) Show that if the slope (b1) is known and only the intercept (b0) is
to be fitted, the least squares fit for b0 is b0-hat = Y-bar -
b1*X-bar. (To do this, you need to differentiate the sum of
squared errors (residuals) with respect to b0, set it equal to 0,
and solve for b0-hat.)
Optional problem:
6) 13.70 parts (a)-(c), (e)-(f) (pp. 532-3)
If you have the 8th edition, the corresponding problems are:
1) 10.70 (p. 381), 2) 11.5 (p. 405), 3) 13.6 (p. 497), 4) 13.17
(p. 503), 5) (above), 6) 13.68 (p. 539)