A process is in control when the average amount of instant coffee that is packed in jar, is 6 oz. the standard deviation is 0.2 oz. a sample of 20 jars is selected at random and the sample average is found to be 6.1 oz. is the process out of control?
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Step-by-step explanation:
test statistic is a t df=99, 0.975 with critical value |t|>1.964
t=(6.1-6.0)/0.2/sqrt(100)
=0.1*sqrt(100)/0.2=1/.2=5
reject Ho, p-value is <0.0001
the process is out of control.
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