Do one of the following, as appropriate:
(a) Find the critical value zα/2,
(b) find the critical value tα/2,
(c) state that neither the normal nor the t distribution applies. 91%; n = 45; σ is known; population appears to be very skewed.
a. tα/2 = 1.645
b. zα/2 = 1.75
c. zα/2 = 1.70
d. tα/2 = 1.34