### Statistics 227

## Homework 5

Due Wednesday, 6 November 1996

- For this problem use the data from the Child Health and Development
Study (CHDS) described in detail on pp. 57-59 of Selvin. The data are
available on the WWW in the directory Selvin Data Sets, under the file
name TBL-CHDS.DAT. Suppose you are interested in some of the
factors affecting birth weight.

(a) Perform a multiple linear regression of
birth weight (in pounds, column 4) against gestation
(in weeks, column 5), mother's height
(in inches, column 8), mother's
pre-pregnancy weight (in pounds, column 9), and father's height (in
inches, column 13). For each predictor, does it
seem to contribute something to the regression when the other predictors
are in the model?

(b) Consider the assumptions underlying regression. To what extent can
they be checked? Do appropriate diagnostic plots and comment on the
results.

- Selvin, page 135, Problem 4.

- Selvin, pages 136-137, Problem 10.

- Selvin, Page 167, Problems 1 and 2.

Last updated 29-Oct-96

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