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Differences between a population and a sample

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Determine whether the group is a sample or a population.

a. The participants in a study of a new cholesterol drug
b. The drivers who received a speeding ticket in Kansas city last month
c. Number of people on welfare in Cook County (Chicago) Illionis
d. The 30 stocks reported as part of the Dow Jones industrial average.

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This question deals with the differences between a population and a sample. 4 examples are provided. Answers and explanations are given for each of the 4 examples.

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(a) This is a sample, because it is a subset of all of the people who could have participated in the study.

(b) This is a population consisting of all people who received a speeding ticket in KC last month. it is ...

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