A firms advertising policy for the following year will be dependent on the market preference for their

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A firm’s advertising policy for the following year will be dependent on the market preference for their product. Thus, the company is willing to estimate with 95% confidence level and the standard error of 0.05.

a. Assume that preliminary reports indicate that 25% of users prefer their product, determine the sample size to make an estimate for the preference of the firm’s product.

b. Assuming that the firm does not know the population proportion, what sample size should be used by the firm?

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