DE 10 Quiz

A z-statistic is used when we have the population mean and population standard deviation.

Testing differences between two independent samples is referred to as an independent populations t-test.

The null hypothesis notes that there is no difference between the groups we're studying.

When the population's standard deviation is UKNOWN, you use _______ test.

H1: Students that take a SAT prep course will score higher than students that do not. Is this one- or two tailed?

If none of the observations in one group is in anyway related to the observations in another group, use a Z- test.

I'm studying whether people who practice their speech score higher than those that don't. What's the IV?