Answer the following question: Bottom of Form Question 8.1 , page 282 If X bar = 85, σ = 8, and n = 64, construct a 95% confidence interval estimate for the population mean, µ. Show work! That is to draw the a) normal curve, b) put in the given information(mean and standard deviation), c) identify the area to be solved, d) show the Z conversion of the X values, e) use the Standardized normal Table, f) give interpretation of your results. Question 8.40, page 292 If a quality control manager wants to estimate, with 95% confidence, the mean life of light bulbs to within ±20 hours and also assumes that the population standard deviation is 100 hours, how many light bulbs need to be selected? Show work! See the steps above (a) through (f)