5. Find the critical values (“z", x² or “t" scores) for the following. C.L. = 98%, n is 25 and o is unknown. Alpha is 10%, the sample size is 45 and sigma is known. df = 28, alpha = 0.005 (find the left tail value). n = 18, degrees of freedom = 17 and a = 0.05. (x²R and x2 а. b. C. %3D d.
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