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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
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Comparing apples and oranges
We want to provide a procedure for “standardizing” a distribution.
Remember
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What happens when we add or a subtract a constant to every score in a distribution?
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Mean?
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SD?
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What happens when we multiply or divide a constant to every score in a distribution?
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Mean?
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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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View Full DocumentGoal and getting to the goal
1. Get a distribution that has a mean of 0.
2. Get a distribution that has a standard deviation of 1.
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 Fall '08
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