notes 22 - Finding Cumulative Probabilities Submitted by...

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Finding Cumulative Probabilities Submitted by gfj100 on Wed, 11/11/2009 - 10:43 Using the Standard Normal Table in the appendix of textbook or see a copy at Standard Normal Table Table A.1 in the textbook gives normal curve cumulative probabilities for standardized scores. A standardized score (also called z -score) is . Row labels of Table A.1 give possible z -scores up to one decimal place. The column labels give the second decimal place of the z -score. The cumulative probability for a value equals the cumulative probability for that value's z -score. Here, probability speed less than or equal 73 mph = probability z-score less than or equal 1.60. How did we arrive at this z-score? Example In our vehicle speed example, the standardized scores for 73 mph is . We look in the ".00" column of the "1.6" row (1.6 plus .00 equals 1.60) to find that the cumulative probability for z = 1.60 is 0.9452, the same value we got earlier as the cumulative probability for speed = 73 mph. Example
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notes 22 - Finding Cumulative Probabilities Submitted by...

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