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Mathematics, 05.08.2020 17:01 hjgdk6018
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 σ = 58.2 σ=58.2 dollars. You would like to be 90% confident that your estimate is within 4 dollar(s) of average spending on the birthday parties. How many moms do you have to sample? Do not round mid-calculation.
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