For 135 consecutive days, a process engineer has measured the temperature of cham- pagne bottles as they are made ready for serving. Each day, she took a sample of 8 bottles. The average across all 1080 bottles (135 days, 8 bottles per day) was 42 degrees Fahrenheit. The standard deviation across all bottles was 1.5 degrees. When constructing an X-bar chart, what would be the center line?
___________ degrees Fahrenheit
A company making tires for bikes is concerned about the exact width of its cyclocross tires. The company has a lower specification limit of 22.7 mm and an upper specification limit of 23.2 mm. The standard deviation is 0.13 mm and the mean is 22.95 mm. What is the process capability index for the process? Round answer to 4 decimal places.