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Which of the following is a requirement that must first be satisfied before running a z-test for the difference between two means? a. The standard

Which of the following is a requirement that must first be satisfied before running a z-test for the difference between two means?

a. The standard deviations for both populations must be known.

b. The standard deviations should come from each sample.

c. The samples must be independent of each other.

d. The populations must be approximately normal.

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