Find the critical value to 2 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 80% and sample size 5 Critical value = X Part 2 of 4 (b) For level 90% and sample size 10 Critical value Part 3 of 4 (c) For level 95% and sample size 25 Critical value Part 4 of 4 (d) For level 99.5% and sample size 11 Critical value =