Applied Statistics in the Behavioral Sciences chapter 9 part 2

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Chapter 9 1) We should use a t distribution when we don’t know the population standard deviation and also when we are comparing two samples . 3) Standard deviation is needed to calculate the standard error. Calculating the standard deviation is the only difference between a z test with the z distribution and a t test with a t distribution. For a t test with a t distribution, instead of dividing by N, We divide by (N – 1) . 6) It is appropriate to use a single-sample t test when we are comparing data from one

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