Look at the 95% confidence intervals for the variables sd10, sd50, and sd90. a. Identify the interval for sd10. b. Identify the interval for sd50. c. Identify the interval for sd90. d. How does the change to standard deviation of the population effect the confidence interval? Explain.

Descriptives Statistic Std. Error sd10 Mean 50.2728 2.34965 95% Confidence Interval for Lower Bound 44.9575 Mean Upper Bound 55.5880 5% Trimmed Mean 50.1430 Median 50.1148 Variance 55.209 Std. Deviation 7.43024 Minimum 38.61 Maximum 64.27 Range 25.66 Interquartile Range 9.56 Skewness .238 687 Kurtosis .495 1.334 sd50 Mean 73.1080 14.07566 95% Confidence Interval for Lower Bound 41.2667 Mean Upper Bound 104.9494 5% Trimmed Mean 73.8317 Median 74.7628 Variance 1981.241 Std. Deviation 44.51113 Minimum 1.50 Maximum 131.69 Range 130.20 Interquartile Range 72.37 Skewness -.505 687 Kurtosis -.749 1.334 sd90 Mean 26.0986 21.31190 95% Confidence Interval for Lower Bound -22.1123 Mean Upper Bound 74.3095 5% Trimmed Mean 23.5936 Median 27.9689 Variance 4541.973 Std. Deviation 67.39416 Minimum -74.63 Maximum 171.92 Range 246.56 Interquartile Range 61.07 Skewness .703 687 Kurtosis 2.069 1.334