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Chapter 1: Q3-17BSC (page 1)

In Exercises 9–20, identify which of these types of sampling is used: random, systematic, convenience, stratified, or cluster.

Testing Lipitor In a clinical trial of the cholesterol drug Lipitor (atorvastatin), subjects were partitioned into groups given a placebo or Lipitor doses of 10 mg, 20 mg, 40 mg, or 80 mg. The subjects were randomly assigned to the different treatment groups (based on data from Pfizer, Inc.).

Short Answer

Expert verified

Simple random sampling

Step by step solution

01

Given information

To study the cholesterol drug Lipitor, all participants of the study were assigned one of the following groups by means of random assignment.

  • Placebo
  • Lipitor doses of 10 mg
  • Lipitor doses of 20 mg
  • Lipitor doses of 40 mg
  • Lipitor doses of 80 mg
02

Identify the method of sampling

Random sampling implies that the entire set of participants is chosen in such a way that each participant has an equal value of probability for being assigned any treatment in the study.

In the study, any participant can be assigned any of the five treatments, so the chances of assignment are even. In this case, the participants are chosen randomly.

Thus, the sampling method is simple random sampling.

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