When population means are not available in a hypothesis test, the differences between two sample means are used. The following are assumptions made about this type of analysis EXCEPT:

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In a hypothesis test, samples are not dependent.
Key Takeaway: In hypothesis testing, a number of assumptions are made about the sample means that are compared. For example, samples are expected to be randomly drawn and independent. Populations are also normally distributed.

When Population Means Are Not Available in a Hypothesis Test