In: Statistics and Probability
Part variability is critical in the manufacturing of ball
bearings. Large variances in the size of...
- Part variability is critical in the manufacturing of ball
bearings. Large variances in the size of the ball bearings cause
bearing failure and rapid wearout. 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.
- Use a = .10 to determine whether the sample indicates
that the maximum acceptable variance is being exceeded.
- Compute the 90% confidence interval estimate of the variance of
the ball bearings in the population.