Q:Explain in your own words how you determine whether you assume equal variances or not. Why is it important to do this?

I know how/when to apply which test , when I have a prior knowledge about population variances when testing difference of means using t-test.

but if we have to determine whether the variances are equal or not, I can only think if the samples are drawn from the same population they will have equal population variance, cant think of anything else.

can you help me explain this question?

thanks

Sadie

I know how/when to apply which test , when I have a prior knowledge about population variances when testing difference of means using t-test.

but if we have to determine whether the variances are equal or not, I can only think if the samples are drawn from the same population they will have equal population variance, cant think of anything else.

can you help me explain this question?

thanks

Sadie

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