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Indicate which of the following situations involve descriptive statistics and which involve inferential statistics:
a. An annual stockholders' report details the assets of the corporation.

b. A history instructor tells his class the number of students who received an A on a recent exam.

c. The mean of a sample set of scores is calculated to characterize the sample.

d. The sample data from a poll are used to estimate the opinion of the population.

e. A correlational study is conducted on a sample to determine whether educational level and income in the population are related. lected on all federal employees.

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