Question: Identify the consequences (i.e., increase, decrease, or none) that the following procedures are likely to have on both bias and sampling error in an observational

Identify the consequences (i.e., increase, decrease, or none) that the following procedures are likely to have on both bias and sampling error in an observational study.

a. Matching sampling units between treatment and control

b. Increasing sample size

c. Ensuring that the frequency distribution of subject ages is the same in the two treatments

d. Using a balanced design

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