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An experiment was found to have an SEP of 10% and a sample proportion of 80%....

An experiment was found to have an SEP of 10% and a sample proportion of 80%. What was the size of the sample, n?

To celebrate 24 years in business, a clothing store's marketing executive is ordering scratch-off discount coupons to give to customers. She would like 40% of customers in the population to receive the highest possible discount, with and SEP of 0.01 for this population. How many coupons should she order?

Can someone help with both problems?

math   Statistics-And-Probability   
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Answer #1

sep = standard error of proportion = sqrt(pq/n) = 0.10

p = 0.8 , q = 1- p = 0.2

sqrt(0.8 * 0.2/n) = 0.1

solving n = 16

Q2)

similar to Q1

sqrt(0.4 * 0.6/n) = 0.01

n = 2400

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