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9 Cards in this Set
- Front
- Back
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variance of x |
S_(xx)/(n-1) |
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What is variance of y? |
S_(yy)/(n-1) |
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What is the covariance of xy? |
S_(xy)/n-1 |
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How do you calculate the correlation coefficient? |
r= S_(xy)/(sqrtSxxSyy) |
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Based on the correlation coefficient, when would the graph show a strong correlation? |
If the absolute value of the correlation coefficient (r) is greater than 0.7, then the graph shows a strong correlation. |
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How do you calculate S_(xx)? |
S_(xx)= (sum of all x^2) - ( sum of all x)^2 / n |
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How do you calculate S_(yy)? |
S_(yy)= (sum of all y^2)-(sum of all y)^2/n |
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How do you calculate S_(xy)? |
S_(xy)= (sum of all xy)-[(sum of all x)(sum of all y)] divide by 2 |
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What does |
r>0 = positive correlation r<0 = negative correlation |
