The manager of a paint supply store wants to determine if the mean amount of paint contained in 1- gallon cans purchased from a nationally known manufacturer is actually less than 1-gallon. It is known that for this manufacturer the population standard deviation of the amount of paint is equal to 0.02 gallons. A random sample of 73.0 cans is selected, and the mean amount of paint per 1-gallon can is 1.00 gallons. Use a significance level of 0.05. Is (are) the critical region(s) for this test in the left tail, right tail, or both tails?

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