A technician working for the Chase-National Food Addictive Company would like to estimate the preserving ability of a new additive. This additive will be used for unb brand preserves. Based on past tests, it is believed that the time to spolage for this additive has a standard deviation of 16 days. To be 95 % confident of the true mean time to spolage, what sample size will be needed to estimate the mean time to spoilage with an accuracy of one day?

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