Find the critical value , needed to construct a confidence interval of the given level with the given sample size. Round the answers to three decimal places. Part 1 of 4 (a) For level 95% and sample size 7 Critical value = X Part 2 of 4 (b) For level 98% and sample size 12 Critical value = X 5 Part 3 of 4 (c) For level 99% and sample size 27 Critical value X 5 Part 4 of 4 (d) For level 98% and sample size 14 Critical value = X 5