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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? Question 17 options:

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

Question 17 options:

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

b. The standard deviations should come from each sample.

c. The samples must be dependent.

d. The populations must be approximately normal.

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