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Do one of the following, as appropriate (a) Find the critical value Z a/2 , (b) Find the critical value t a/2 , (c) state

Do one of the following, as appropriate (a) Find the critical value Z_a/2, (b) Find the critical value t_a/2, (c) state that neither the normal not the t distribution applies.

Confidence level 95%, , Standard deviation is known, population appears to very skewed. Find the critical value. Please show work

(a) Z_a/2= 2.055
(b) T_a/2= 2.214
(c) T_a/2= 2.552
(d) Z_a/2= 2.33
(e) Neither normal or t distribution applies.

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