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A Tax Prep Time hrs 7 B 0 1 2 33 34 35 36 37 38 618949 39 40 35 3 30 5 37 4 26 5 13 49 9 28 8 44 61 6 0 5 40 5 34 9 47 9 36 6 24 1 39 8 47 8 18 5 36 6 39 2 14 5 37 3 40 5 49 3 45 5 28 3 19 5 5 6 52 6 41 4 45 3 39 33 7 29 4 14 5 40 1 33 7 36 9 5 6 33 7 B Interval Estimate of a Population Mean Sigma Known Case Sample Size Sample Mean Population Standard Deviation Confidence Coefficient Level of Significance Margin of Error Point Estimate C I Lower Limit C I Upper Limit Data range A A 10 0 95 E F Formulas Used N A N A N A N A N A N A N A G

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