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because it now believes that book cost per semester is greater than $300.00. A random sample of 225 current students finds that the sample average

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because it now believes that book cost per semester is greater than $300.00. A random sample of 225 current students finds that the sample average is $324 with a standard deviation of $60. What is the standard error of the mean under the null hypothesis? O $60 O $4 O $8 O $15

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