3.42 Calcium and the bones of young girls. Refer to the previous exercise.

1. (a) Outline a matched pairs design in which each girl receives both levels of calcium (with a “washout period” in which no calcium supplementation was given between the two treatment periods).

2. (b) What is the advantage of the matched pairs design over the completely randomized design?

3. (c) The same randomization can be used in different ways for both designs. Explain why this is true.

4. (d) Use software or Table B to do the randomization. Explain what each subject will do for the matched pairs design.