Part variability is critical in the manufacturing of ball bearings. Large variances in the size of the ball bearings cause bearing failure and rapid wear-out. Production standards call for a maximum...

Extracted text: Part variability is critical in the manufacturing of ball bearings. Large variances in the size of the ball bearings cause bearing failure and rapid wear-out. Production standards call for a maximum variance of .0001 when the bearing sizes are measured in inches. A sample of 15 bearings shows a sample standard deviation of .014 inches. 10 to determine whether the sample indicates that the maximum (1) Use a = acceptable variance is being exceeded. (ii) Compute the 90% confidence interval estimate of the variance of the ball bearings in the population Do NOT use EXCEL O a) (1) Variance exceeds maximum variance requirement. (ii) Between 0.00012 and 0.00042 Ob) 1) Variance exceeds maximum variance requirement. () Between O.00052 and 0.00092 O Variance does not exceeds maximum variance requirement. (1i) Between 0.0012 and 0.0042 d) None of the answers are correct