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A toy manufacturer wants to know how many new toys children buy each year. Assume a previous study found the variance to be 3.61 .
A toy manufacturer wants to know how many new toys children buy each year. Assume a previous study found the variance to be 3.61
. He thinks the mean is 7
toys per year. What is the minimum sample size required to ensure that the estimate has an error of at most 0.12
at the 85%
level of confidence? Round your answer up to the next integer.
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