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Do one of the​ following, as appropriate.

Do one of the​ following, as appropriate.​ (a) Find the critical value z_alpha/2​, ​(b) find the critical value t_alpha/2 ​, 
​(c) state that neither the normal nor the t distribution applies.
Confidence level 95​%;  n = 27​; 
sigma is unknown
​; 
population appears to be normally distributed.