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Mathematics, 02.07.2020 17:01 hebiancao
The sales of a grocery store had an average of $7,000 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 100 days of sales was selected. It was found that the average was $7,280 per day. From past information, it is known that the standard deviation of the population is $1,000.At a 5% significance level one can conclude that a. The advertising campaigns increased the average daily sales. b. The advertising campaigns decreased the average daily sales. c. The average daily sales remained unchanged d. Cannot tell from the information provided
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