In testing a hypothesis about two population means, if the t distribution is used, which of the following assumptions is required? Select one:
a. Both populations are normally distributed.
b. The standard deviations are not the same.
c. Both population means are the same.
d. The sample sizes are equal.

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one way archaeology us understand the past is through the material objects it finds, allowing us to know what was being used, and when. for example a dig recently found a flute, believed to be the oldest musical instrument found to date.

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