(b) Construct an interval estimate of / with 95% confidence, assuming that s= 20. (Round your answers to 3 decimal places.) The 95% confidence interval is from to (c) Construct an interval estimate of / with 95% confidence, assuming that s = 40. (Round your answers to 3 decimal places.) The 95% confidence interval is from toA random sample of 12 items is drawn from a population whose standard deviation is unknown. The sample mean is a = 800 and the sample standard deviation is s = 10. Use Appendix D to find the values of Student's t