The Daily Yield For A Local Chemical Plant Has Averaged 810 Tonnes For The Last Several Years The Quality Control Manag 1 (54.2 KiB) Viewed 111 times
The Daily Yield For A Local Chemical Plant Has Averaged 810 Tonnes For The Last Several Years The Quality Control Manag 2 (54.2 KiB) Viewed 111 times
The daily yield for a local chemical plant has averaged 810 tonnes for the last several years. The quality control manager, Roxie Williams would like to know whether this average has changed in the recent months. She randomly selects 49 days from the computer database and computes the average and standard deviation of the 49 yields as sample mean is 800 tonnes. The population standard deviation 21 tonnes. Do you think there is enough evidence to believe there has been a change? Find the p-value. (6 marks)
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