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

mark branliest

step-by-step explanation:

.6 is 1/2 of 12

the answer is actually d. i just took the test

answear:

a

step-by-step explanation: a