Identify which of these types of sampling is used: cluster, convenience, simple

Question

Identify which of these types of sampling is used: cluster, convenience, simple random, systematic, or stratified. Please explain

(a) The quality control department of a semiconductor manufacturing company tests every 100th product from the assembly line.

(b) UMUC STAT Club wanted to estimate the study hours of STAT 200 students. Two STAT 200 sections were randomly selected and all students from these two sections were asked to fill out the questionnaire.

(c) A STAT 200 student is interested in the number of credit cards owned by college students. She surveyed all of her classmates to collect sample data.

(d) In a career readiness research, 100 students were randomly selected from the psychology program, 150 students were randomly selected from the communications program, and 120 students were randomly selected from cyber security program.

Explanation / Answer

(a) systematic

Systematic sampling : the list of elements is counted off i.e every kth element is taken.

(b) Cluster sampling

Cluster sampling is accomplished by dividing the population into groups -- usually geographically. These groups are called clusters or blocks. The clusters are randomly selected, and each element in the selected clusters are used.

(c)Convenience sampling

Convenience sampling is very easy to do, but it's probably the worst technique to use. In convenience sampling, readily available data is used. That is, the first people the surveyor runs into.

(d) Stratified sampling

Stratified sampling also divides the population into groups called strata. However, this time it is by some characteristic, not geographically. For instance, the population might be separated into males and females. A sample is taken from each of these strata using either random, systematic, or convenience sampling.

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