help me on this question?

A CI is desired for the true average stray-load loss , (watts) for a certain type of induction motor when the line current is held at 10 amps for a speed of 1500 rpm. Assume that stray-load loss is normally distributed with a = 3.3. (Round your answers to two decimal places.) (a) Compute a 95% CI for u when n = 25 and x = 53.1. 55.8848 x , watts (b) Compute a 95% CI for # when n = 100 and x = 53.1. watts (c) Compute a 99% CI for # when n = 100 and x = 53.1. watts (d) Compute an 82% CI for u when n = 100 and x = 53.1. watts (e) How large must n be if the width of the 99% interval for # is to be 1.0? (Round your answer up to the nearest whole number.) n = You may need to use the appropriate table in the Appendix of Tables to answer this question. Need Help? Read It 4. [1/4 Points] DETAILS PREVIOUS ANSWERS DEVORESTAT9 7.E.006. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER On the basis of extensive tests, the yield point of a particular type of mild steel-reinforcing bar is known to be normally distributed with a = 100. The composition of the bar has been slightly modified, but the modification is not believed to have affected either the normality or the value of a. (a) Assuming this to be the case, if a sample of 25 modified bars resulted in a sample average yield point of 8422 lb, compute a 90% CI for the true average yield point of the modified bar. (Round your answers to one decimal place.) 1b (b) How would you modify the interval in part (a) to obtain a confidence level of 94%? (Round your answer to two decimal places.) The value of z should be changed to