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Question
Based on a random sample of 25 units of product X, the average weight is 102 lb and the sample standard deviation is 10 lb. We would like to decide if there is enough evidence to establish that the average weight for the population of product X is greater than 100 lb. Assume the population is normally distributed. Using the critical value rule, at 
= .05, we do not reject H0.
Answer
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Control charts are used to reduce common causes of variation.
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