Question

For 120 consecutive days, a process engineer has measured the temperature of champagne bottles as they are made ready for serving. Each day, she took a sample of 8 bottles. The average across all 960 bottles (120 days, 8 bottles per day) was 46 degrees Fahrenheit. The standard deviation across all bottles was 0.8 degree. When constructing an X-bar chart, what would be the center line?

Answer 1

Answer: 46 degrees Fahrenheit

Explanation: Center line is an X double bar which is average across all components. Here it is already given that te average across all 960 bottles (120 days, 8 bottles per day) was 46 degrees Fahrenheit.

There is no need to solve since it's already given therefore the Centre line is 46 degrees Fahrenheit.