Do one of the following as appropriate a Find the value za2

Do one of the following, as appropriate. (a) Find the value z_(a/2), (b) Find the critical value t_(a/2) , (c) State that neither the normal nor that distribution applies. Confidence level 95%; n = 17, ? is known; population appears to be very skewed.

Solution

Confidence level 95%; n = 17, ? is known

Since confidence level is known normal distribution applies and we use z score

alhpa = 1 - 0.95 = 0.05

alpha/2 = 0.025

z_(a/2) = z_(0.025) = -1.96