Please show detailed calculations and work. Find the critical values (“z”, "? ? "?? “t” scores) for the following. a. C.L. = 98%, n is 25 and σ is unknown. b. Alpha is 3%, the sample size is 45 and...

Find the critical values (“z”, "? ? "?? “t” scores) for the following. a. C.L. = 98%, n is 25 and σ is unknown. b. Alpha is 3%, the sample size is 45 and sigma is known. d. α is .5%, n=15;sigma is known for the left tail (not “z”) e. 90%, chi-square right, when the sample size is 22.( ? ? ?)