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(t)2 (s)z <br />nmin = --(d Xbar)Z <br />where: n~ =minimum sample size <br />t =the Student's t distribution value at the 90'% confidence level <br />s =sample standard deviation (s)2= sample variance <br />d =percent acceptable deviation from the mean (10%) <br />Xb~ =sample mean <br />-5- <br />