The manager of a toy store wants to estimate the population mean of daily online customers by using a 90% confidence interval estimate that has a margin of error of ±50.0. If the population standard deviation is thought to be 300, what is the required sample size?
A) 139
B) 100
C) 10
D) 98

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The Answer of The manager of a toy store wants to estimate the population mean of daily online customers by using a 90% confidence interval estimate that has a margin of error of ±50.0. If the population standard deviation is thought to be 300, what is the required sample size?
A) 139
B) 100
C) 10
D) 98

The Manager of a Toy Store Wants to Estimate the Population