Question: Which condition must be met to conduct a test for the difference in two sample means using a z -statistic? Select one: a. The data

Which condition must be met to conduct a test for the difference in two sample means using az-statistic?

Select one:

a. The data must be at least of nominal scale.

b. The populations must be normal.

c. The two population standard deviations must be known.

d. The samples are dependent.

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