What’s the correlation?
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RDG M ATH SCI CIV CONCPT 20 40 60 80 20 40 60 80 40 60 80 40 60 80 20 40 60 80 20 40 60 80 20 40 60 80 20 40 60 80 -2 0 2 -2 0 2 What’s the correlation?
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What’s the correlation?. What’s the correlation?. What’s the correlation?. .69. What’s the correlation?. What’s the correlation?. .68. What’s the correlation?. What’s the correlation?. . 60. What’s the correlation?. What’s the correlation?. .13. What’s the correlation?. - PowerPoint PPT Presentation
Transcript of What’s the correlation?
Whats the correlation?
Whats the correlation?
Whats the correlation?
Whats the correlation?.69
Whats the correlation?
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Whats the correlation?
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Rounded, the mean reading score is 52 and sd=10 and the mean math score is also 52 and sd=10. If a given students reading score is 67, then what is your best estimate of her math score? .69
In predicting someones math score, if you could have just one piece of information, and it is either (a) her reading score, or (b) her self concept score, which would you rather have? Whats it worth to you?.69.16
Explain to a non-statistician what it means to say reading and math scores are correlated r=.69 in this population..69A key to understanding rzy = zxWhen X and Y are perfectly correlated25We can say that zx perfectly predicts zy
zy = zx
Or
zy = zx
^26When they are imperfectly correlated, i.e., rxy 1 or -1zy = rxyzxr is the slope of the predicted line, with a zero-intercept of zy=027Explain to a non-statistician what it means to say reading and math scores are correlated r=.69 in this population.
