# MATH221_W4_Lab - MATH 221 Statistics for Decision Making...

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MATH 221 Statistics for Decision Making Week 4 iLab Name: _______ ______________ MATH221 Statistical Concepts: Probability Binomial Probability Distribution Calculating Binomial Probabilities Open a new Excel worksheet. 1. Open spreadsheet 2. In cell A1 type “success” as the label 3. Under that in column A, type 0 through 10 (these will be in rows 2 through 12) 4. In cell B1, type “one fourth” 5. In cell B2, type “=BINOM.DIST(A2,10,0.25,FALSE)” [NOTE: if you have Excel 2007, then the formula is BINOMDIST without the period] 6. Then copy and paste this formula in cells B3 through B12 7. In cell C1, type “one half” 8. In cell C2, type “=BINOM.DIST(A2,10,0.5,FALSE)” 9. Copy and paste this formula in cells C3 through C12 10. In cell D1 type “three fourths” 11. In cell D2, type “=BINOM.DIST(A2,10,0.75,FALSE)” 12. Copy and paste this formula in cells D3 through D12 Plotting the Binomial Probabilities 1. Create plots for the three binomial distributions above create the scatter plots in Excel by selecting the data you want plotted and then click on INSERT, CHARTS, SCATTER, and then select the first chart shown which is dots with no connecting lines. Do this two more times and for graph 2 set Y equal to ‘one half’ and X to ‘success’, and for graph 3 set Y equa l to ‘three fourths’ and X to ‘success’. Paste those three scatter plots in the grey area below. (9 points)

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Scatterplot of One Fourth vs. Success Success one fourth Scatterplot of One Half vs. Success Success one half
Scatterplot of Three Fourths vs. Success

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