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coefficient of determination on the TI-86

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Hi, I haven't been alb eot figure out how to figure out how to do the coefficient of determination on the TI-86, I am able to do it on the TI-84, but not the 86. Anyone have any ideas? I have searched on google and there were keystrokes on how to do it on the 86 but while following the steps, some of the buttons they wanted me to press didn't exist on the 86. So I have no idea now. Thanks.

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