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Chapter 1: Q3-14BSC (page 1)

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

Acupuncture Study In a study of treatments for back pain, 641 subjects were randomly assigned to the four different treatment groups of individualized acupuncture, standardized acupuncture, simulated acupuncture, and usual care (based on data from 鈥淎 Randomized Trial Comparing Acupuncture, Simulated Acupuncture, and Usual Care for Chronic Low Back Pain,鈥� by Cherkin et al., Archives of Internal Medicine, Vol. 169, No. 9).

Short Answer

Expert verified

Simple random sampling

Step by step solution

01

Given information

The participants are 641.

The number of treatments in the study is four, and they include:

  • Individualized acupuncture
  • Standardized acupuncture
  • Simulated acupuncture
  • Usual care
02

Identify the method of sampling

In simple random sampling, any experimental unit will always have the same chance to be selected from the population.

In the study, the participants are assigned to four treatment groups randomly. Therefore, any subject has an equal chance of being part of any of the treatment groups. The simple process is to randomly allocate the subject to one of the treatment groups by the method of randomization.

Thus, simple random sampling is used to assign 641 subjects to four treatment groups.

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