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STATISTICS: how to find minimum necessary sample size?

Answer

Liz. CI = mean +/- (t*standard deviation / sqrt n) where t* = 2.365 using a t-table and 7 d.f. with 5%/2 = 0.025 in the tails. CI = 1.7175 +/- (2.365 )0.407387 / sqrt 8) CI = 1.3769 to 2.0581. hope that helped.
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