Zscores Class Notes

# Zscores Class Notes - z Scores Recap/Additional Practice...

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z Scores Recap/Additional Practice - Standard deviations allow researchers to make predictions about sample data - It bridges the gap between descriptive and inferential statistics Box Plot (Example) SPSS z Scores Context Example 1 Context Example 2 Depression score = 11 English: 80 Analytical reasoning score = 275 Math: 65 Adaptive coping score = 36 Psychology: 75 What do these scores mean? What could we use to make sense of these scores? (goal for today’s class) Z scores conceptually Comparing apples and oranges We want to provide a procedure for “standardizing” a distribution. Remember What happens when we add or a subtract a constant to every score in a distribution? Mean? SD? What happens when we multiply or divide a constant to every score in a distribution? Mean? SD? Standard score: Score that indicates the location of a raw score in a distribution, expressed as the number of standard deviations from the mean. Dr. Viji Sathy, UNC, class notes page 1

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Goal and getting to the goal 1. Get a distribution that has a mean of 0.
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