Use the sample information x = 43, o= 3, n = 11 to calculate the following confidence ntervals for u 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% confidence interval is from to 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. lets wider as the confidence level increases