Question

Do one of the following, as appropriate. (a) Find the critical value za/2 (b) Find the critical value ta/2 (c) state that neither the normal nor the t distribution applies. Confidence level 90%; n=19; Ơ is known; population appears to be very skewed.
Find the critical value.
A. Ta/2 = 1.330
B. Ta/2 = 1.734
C. Za/2 = 1.28
D. Za/2 = 1.645
E. Neither normal nor t distribution applies.