Construct a confidence interval for u assuming that each sample is from a normal population. (a) x =25, 0=5, n=10, 90 percentage confidence. (Round your answers to 2 decimal places.) The 90% confidence interval is from _ ) (b) Xx=120, 0=7, n= 25, 99 percentage confidence. (Round your answers to 2 decimal places.) The 99% confidence interval is from _ . (c) X=13.2, 0=1.9, n=47, 95 percentage confidence. (Round your answers to 3 decimal places.) The 95% confidence interval is from _ . Use the sample information X = 43, 0= 6, n=13 to calculate the following confidence intervals for i 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 _m_ (b) 95 percent confidence. (Round your answers to 4 decimal places.) The 95% confidence interval is from m (c) 99 percent confidence. (Round your answers to 4 decimal places.) The 99% confidence interval is from _ A random sample of 165 items is drawn from a population whose standard deviation is known to be o= 70. The sample mean is X = 900. (a) Construct an interval estimate for / with 98 percent confidence. (Round your answers to 1 decimal place.) The 98% confidence interval is from to (b) Construct an interval estimate for / with 98 percent confidence, assuming that o= 140. (Round your answers to 1 decimal place.) The 98% confidence interval is from to (c) Construct an interval estimate for / with 98 percent confidence, assuming that o= 280. (Round your answers to 1 decimal place.) The 98% confidence interval is from to