Suppose it is known that the standard deviation of the weight of 10-ounce packages of cookies is 0.20 ounces. To check whether the true average is, on a given day, 10 ounces, employees select a random sample of 36 packages and find that their mean weight is ?̅= 9.45 ounces. Perform a hypothesis test on this data, checking at the ?= .01 significance level.

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