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goldfiish [28.3K]
3 years ago
6

A grocery store has an average sales of $8000 per day. The store introduced several advertising campaigns in order to increase s

ales. 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 $8300 per day. From past information, it is known that the standard deviation of the population is $1200. The p-value is
Business
1 answer:
vitfil [10]3 years ago
5 0

Answer:

0.0062

Explanation:

p = 1 - P(Z < Zcal)

Zcal = (8300-8000)/ (1200/√100)

Zcal = 2.5

p = 1 - P(Z < Zcal)

= 1 - P(Z < 2.5)

= 1 - 0.9938

= 0.0062

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