What two assumptions must be met when you are using the z test to test differences between two means Math3 Week 1 Discussion help

What two assumptions must be met when you are using the z test to test differences between two means? Can the sample standard deviations s1 and s2 be used in place of the population standard deviations Ï1 and Ï2?

100 words or more.

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What two assumptions must be met when you are using the z test to test differences between two means Math3 Week 1 Discussion help