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Mathematics, 18.12.2019 19:31 dee0828

The sales of a grocery store had an average of $8,000 per day. the store introduced several advertising campaigns in order to increase sales. to determine whether or not the advertising campaigns have been effective in increasing sales, a sample of 64 days of sales was selected. it was found that the average was $8,300 per day. from past information, it is known that the standard deviation of the population is $1,200. the value of the test statistic is:
the p-value is, (round to 4 decimal places):

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