Homework #2 - Due Friday, 9/21/2007

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Please answer clearly, in full sentences, on one side only of your own paper, leaving plenty of space for remarks by the graders. Staple your pages if you can. You may collaborate with others in and out of the class, but you must prepare your own answers. Papers are due at the start of class on Friday.

A. In chapter 5, do problems 5.1, 5.2, 5.5, 5.17, 5.23.

   For problem 5.1: Explain why an observational study might be much more favorable to the less-invasive treatment than an experiment would be.

   For problem 5.2: Also, identify at least one possible source of bias in this experiment.

B. In chapter 6: do problem 6.6.

C. Also in chapter 6, read problems 6.4, 6.9, 6.13, 6.14; we'll discuss them in class Friday if not before.