Question: Determine the sample size needed to estimate the average weight of all second-grade boys if we want to be within 1 pound with 90% confidence.

  1. Determine the sample size needed to estimate the average weight of all second-grade boys if we want to be within 1 pound with 90% confidence. Assume we know that the standard deviation of such weights is 3 pounds. Round the sample size UP to the nearest whole number.

z90=______________

standard deviation =______________

margin of error =_____________

n =____________

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