The t-distribution should be chosen over the z-distribution for hypothsis testing if:

If you don't know the value of sigma (population standard deviation), then you must use the T distribution instead of the Z distribution. However, if the sample size n is greater than 30, then the T distribution is approximately the same as the Z distribution.

This means that even if you don't know sigma, you can use the Z distribution if n > 30.

In short, you use T over Z if you don't know sigma and n = 30 or smaller

c 1 hour

step-by-step explanation:

m = 2e

m = 2 so 2 = 2e

1 = e

a 360 degree rotation

step-by-step explanation: