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Use the sample information 5: = 40, 0 = 7, n = 13 to calculate the following confidence intervals for [J assuming the sample is from a normal population. (a) 90 percent confidence. (Round your answers to 4 decimal places.) The 90% confidence interval is from to (b) 95 percent confidence. (Round your answers to 4 decimal places.) The 95% condence interval is from to (c) 99 percent condence. {Round your answers to 4 decimal places.) The 99% condence interval is from to (cl) Describe how the intervals change as you increase the confidence level. 0 The interval gets narrower as the confidence level increases. 0 The interval gets wider as the condence level decreases. O The interval gets wider as the condence level increases. 0 The interval stays the same as the condence level increases