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A radio station sells advertising spots on the basis that the mean age of its listeners is 25 years. Assume that a random sample of 64 listeners shows a mean age of 26 yrs and a standard deviation of 5 yrs.

At the 5% significance level, can the station conclude that the mean age of its listeners is not 25 yrs. Formulate and test the appropriate hypotheses. Use the critical value approach.

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