The mean daily amount of her tips was 84.85. at the .01, Ask an Expert

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At the time she was hired as a server at the Grumney Family Restaurant, Beth Brigden was told, "You can average more than $80 a day in tips." Assume the standard deviation of the population distribution is $3.24. Over the first 35 days she was employed at the restaurant, the mean daily amount of her tips was $84.85. At the .01 significance level, can Ms. Brigden conclude that she is earning an average of more than $80 in tips?

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