Question

A critical dimension on a pressure fitting is intended to be 0:500in. If the parts run larger they can become difficult or impossible to assemble. If the parts run smaller there is a chance that they will leak. A random sample of n 18 parts was drawn from a large lot and inspected. The observations were: x = {0.497; 0.494; 0.496; 0.499; 0.499; 0.499; 0.497; 0.491; 0.495; 0.501; 0.504; 0.501; 0.492; 0.497; 0.500; 0.498; 0.498; 0.497] 8, 023, a. b. c. Test the hypotheses Ho: ?-0.500 vs. HA: ? < 0.500 at ?-0:05. Is the normality assumption satisfied? Construct and interpret the 95% confidence interval for the true population mean.

Answer 1