Refer to the Journal for Engineering for Industry (May 1993) study of deep hole drilling under drill chip congestion, Exercise 8.32. Test to determine whether the true standard deviation of drill chip lengths differs from 75 mm. Recall that for n = 50 drill chips, s = 50.2.

Data from Exercise 8.32

Deep hole” drilling is a family of drilling processes used when the ratio of hole depth to hole diameter exceeds 10. Successful deep hole drilling depends on the satisfactory discharge of the drill chip. An experiment was conducted to investigate the performance of deep hole drilling when chip congestion exists (Journal of Engineering for Industry, May 1993).