Use the sample Information X = 40, o=7, n= 13 to calculate the following confidence intervals for / assuming the sample is from a normal population. 5 (a) 90 percent confidence. (Round your answers to 4 decimal places.) points The 90% confidence interval is from to Book Hint (b) 95 percent confidence. (Round your answers to 4 decimal places.) Ask The 95% confidence interval is from to Print References (c) 99 percent confidence. (Round your answers to 4 decimal places.) The 99% confidence interval is from to (d) Describe how the Intervals change as you increase the confidence level. O The interval gets narrower as the confidence level increases. The Interval gets wider as the confidence level decreases. The interval gets wider as the confidence level increases. O The Interval stays the same as the confidence level increases