SOLUTION: A process is in control when the average amount of instant coffee that is packed in a jar, is 6 oz. The standard deviation is 0.2 oz. A sample of 100 jars is selected at random and

Question 1082995: A process is in control when the average amount of instant coffee that is packed in a jar, is 6 oz. The standard deviation is 0.2 oz. A sample of 100 jars is selected at random and the sample average is found to be 6.1 oz. Is this process out of control?
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
Ho: mean is 6
Ha:mean isn't 6
alpha=0.05 P{reject Ho|Ho true}
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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