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Psychology 2810 Lecture Notes - Standard Score, Standard Deviation

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School
Western University
Department
Psychology
Course
Psychology 2810
Professor
Tony Vernon

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Document Summary

P(a x b) = p(a < x < b) Step 2: look up the p value associated with the z score. Step 3: determine where the score falls on the normal distribution, and find the appropriate probability. It is meant to be a study guide to help you prepare for the exam** When you have a binomial experiment and the n is greater than 25, you cannot use the binomial tables, so must use the normal approximation described below. Example n = 250 p = . 55 q = . 45. Step 1: compute the mean and standard deviation. Remember when using normal approximation you must take a 0. 5 step outside your desired x value to ensure that you are in fact capturing the probability at that value of x. Step 4: look up p value and compute final probability p = . 4370 p(x<125) = . 5 -. 4370.

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