A health psychologist decides to study the effects of class in school (freshman, sophomore, junior, senior) on the number of hours spent studying. 1) what is the independent variable? 2) dependent variable?

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A health psychologist decides to study the effects of class in school (freshman, sophomore, junior, senior) on the number of hours spent studying.
1) what is the independent variable?
2) dependent variable?
3) how many levels would the independent variable have?
Numerical analysis homework help
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