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You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based on previous study, you believe the population

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You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based on previous study, you believe the population standard deviation is approximately o = 50.1 dollars. You would like to be 9% confident that your estimate is within 4 dollar(s) of average spending on the birthday parties. How many parents do you have to sample? Hint: Video D

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