Sampling For each of the following, identify the term that bes...

Question

Sampling For each of the following, identify the term that best describes the type of sample: systematic, convenience, stratified, cluster, or simple random sample.

a. As Lipitor pills are being manufactured, a quality control plan is to select every 500th pill and test it to confirm that it contains 80 mg of atorvastatin.

Accepted Answer

All right, hello, everyone. So this question says to identify the term that best describes the type of sample in the following example. A beverage company inspects every 200th bottle filled on the production line to ensure it contains exactly 500 mL of soda. Option A says systematic sampling. B says convenience, C says stratified, D says cluster, and E says simple random sample. So first and foremost, each answer choice here represents a different type of sampling. So let's take a moment to understand what they mean. So starting off with systematic sampling. Recall that in systematic sampling, the keyword here is that you're selecting every nth item. Or every nth individual from a list. So an example of this would be if you had 100 people in a single file line, selecting every 5th person would be an example of systematic sampling. Convenience sampling, on the other hand, as the name implies, is more about ease of access. So selections. are based on. Ease of access, what is most readily accessible to the researchers. Now stratified sampling first requires. The division of a population into subgroups. And this is actually true of cluster sampling as well. So, in both stratified and cluster sampling, the researchers have to divide the population into subgroups. So here In stratified sampling, the difference is. That individuals are selected. From each subgroup. So individuals from each individual subgroup are sampled in stratified sampling. But cluster sampling, on the other hand, involves a selection of entire groups as opposed to individuals. And last but not least, when it comes to a simple random sample, every individual has an equal chance of being selected. So going back to the example at hand here. In this particular case, the company is selecting from, or rather, the company is following a fixed interval to select the bottles that are going to be included in the study, or that are going to be inspected. So therefore, this matches the definition of systematic sampling, meaning option A is the correct choice here. And there you have it. So with that being said, thank you so very much for watching, and I hope you found this helpful.

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Key Concepts

Systematic Sampling

Sampling Frame

Quality Control

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