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Playbill magazine reported that the mean annual household income of its readers is $119,155. Assume this estimate of the mean annual household income is based

Playbill magazine reported that the mean annual household income of its readers is $119,155. Assume this estimate of the mean annual household income is based on a sample of 80 households, and based on past studies, the population standard deviation is known to be sigma (small)= $30,000.

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