What is the advantage of larger sample size


The mean annual cost of auto insurance is $939. Assume that the standard deviation is $245.

a.) What is the probability that a simple random sample of auto insurance policies will have a sample mean within $25 of the population mean for each of the following sample sizes: 30, 50, 100, and 400

b.) What is the advantage of larger sample size when attempting to estimate the population mean?

 

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Basic Statistics: What is the advantage of larger sample size
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