6_More_Standard_Scores_Outline

6_More_Standard_Scores_Outline - 1 Finding Probabilities,...

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Finding Probabilities, Proportions, or Percentages Under the Standard Normal Curve Probability of an IQ below 132 • 1. Sketch normal curve and find target area Probability of an IQ below 132 • 2. Convert raw score (132) to z score z = (132-100)/16 = 2.00 Probability of an IQ below 132 • 3. Find z of 2.00 in table –Appendix B: Page 586, Column A • 4. Determine columns you need to use •A: z score •B: proportion in body Probability of an IQ below 132 • 5. Determine probability below 132: .9772 Example 2 What percentage of people have IQs below 91? Percentage of IQs below 91 • 1. Sketch normal curve and find target area Percentage of IQs below 91 • 2. Convert raw score (91) to z score z = (91-100)/16 = -.56 Percentage of IQs below 91 • 3. Find z of -.56 in table • 4. Determine columns you need to use •A: for z score –NOTE: There are no negative z scores in the table •C: proportion in tail 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
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Percentage of IQs below 91 • 5. Proportion below z = -.56 is
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This note was uploaded on 08/22/2011 for the course PSY 207 taught by Professor Pfordesher during the Fall '07 term at SUNY Buffalo.

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6_More_Standard_Scores_Outline - 1 Finding Probabilities,...

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