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playbill magazine had reported that the mean

Playbill Magazine had reported that the mean yearly household income of its readers is $119,155. The most recent random sample of 80 households taken from its subscription list had a mean annual household income of $124,450. Past studies have shown that the standard deviation of household income is $30,000. Based on this information, can Playbill's executives conclude that there has been a significant shift in the average yearly income of its readers? (Use alpha = .05).

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