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 99% n=23 \sigma is known; population appears to be very skewed
a) za/2=2.575
b) za/2=2.33
c) ta/2=2.819
d) neither normal nor t distribution applies