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For the sheet-metal stamping machine in certain factory, the time between failures, X1 has a mean between the failures, of 56 hours and a variance of 16 hours. The prepare time X2, has a mean time to repair of 5 hours and a variance of 4 hours.
a) If X1 and X2 are independent , find the expected value and the variance of Y=X1+X2, which represents one operation-repair cycle.
b)Would you expect an operation-repair cycle to last more than 75 hours? Why?
Scatter plot, Correlation coefficient and Regression equation - Do a complete regression analysis by performing the steps below
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You are the production manager of a company. Parachutes are woven in your factory using a synthetic fiber purchased from one of four different suppliers. The most important outcome for parachutes is strength of the fabric.
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Assume that p-value was 0.07, would you reject null hypothesis of equal mean rates for a Type- I error rate of 5%? (Circle one).
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