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What is the standard error of p

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Reference no: EM131229619

Marketing analysts have determined that a particular advertising campaign should make at least 20% of the adult population aware of the advertised product. After a recent campaign, 400 adults were asked whether or not they had seen the ad and were aware of the new product.

a. What is the standard error of p¯?

b. What is the probability that the sample proportion will be less than 15%?

c. What is the probability that the sample proportion will be between 21.25% and 16.25%?

d. What is the probability that the sample proportion will be more than 22.5%?

Reference no: EM131229619

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