Correlation between Math and Chem?

Test Preparation
21

<p>“The data so far shows no correlation. r = -0.0437”</p>

<p>You can’t use an xy scatter to plot the scores and then find the r value, because one score does not cause the other.</p>

<p>The appropriate test would probably be a matched-pairs t-test, where you take the difference between the two scores as the X variable.</p>

22

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<p>First, the r was actually about 0.4 (not including the one person who gave SAT I math instead of IIC).</p>

<p>Second, we are only checking for a correlation, so you can use the linear regression.</p>

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<p>Yes I can. The whole point of plotting points and doing a linear regression is to see if there is a correlation. One does not cause the other, and a cause effect relationship is neither assummed nor proven by finding the correlation coefficient in this way.</p>

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<p>You’re right. I was including the outlier (670,800) who only gave SAT I math scores in my calculation. But even with r=~0.4, the correlation is weaker than I would have expected.</p>

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<p>That’s because you have so many 800s. If the data set was wider, there would be a stronger correlation.</p>

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<p>Math IIc: 800
Chem: 760</p>

<p>I do know that our school checks Chemistry grades for a student’s admission into Honors Precal since Chemistry is taken simultaneously with Algebra II–Precal is the next year.</p>

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<p>SATI math/ic/iic: 800
chem: 790</p>

<p>i dont think its a trend inherent in the tests though…</p>

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<p>whatever the cause, there seems to be somewhat of a relationship</p>

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<p>new SAT I Math - 700
SAT II Chem - 750
AP Chem - 4</p>

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<p>sat2 chem 750
sat2 math2 780
sat1 math 780 (old)
sat1 math 710/730 (new)</p>

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<p>800 iic
780 sat i
700 chem
hmmm maybe i’m just bad at chem :(</p>

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<p>any more? (chars)</p>

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<p>math2c - 780
chem - 780</p>

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<p>bump . . . . .</p>