How many students included in population mean

Reference no: EM13120233

A random sample of 61 students were asked how much they spent for classroom textbooks this semester. The sample standard deviation was found to be s-$28.70. How many more students should be included in the sample to be 99% sure the sample mean x is within $7 of the population mean u for all students at this college?

Reference no: EM13120233

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