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September 18, 2014

September 18, 2014

Posted by **Jannel** on Sunday, February 1, 2009 at 2:45pm.

Predicted Final Exam Score =

Please explain to me how to do this. My teacher does not teach this kind of stuff in class and he expects us to know this.

- Statistics -
**MathGuru**, Sunday, February 1, 2009 at 7:45pmPre-exam: mean = 275, sd = 26

Final exam: mean = 71, sd = 6

Correlation: r = 0.67

Regression equation is in this format:

predicted y = a + bx

...where a = intercept and b = slope.

To find the equation, you need to substitute the information given in the problem into a workable formula:

predicted y = (rSy/Sx)X - (rSy/Sx)xbar + ybar

...where r = correlation, Sy = sd of y, Sx = sd of x, and X is the variable in 'a + bx' equation.

Note: xbar = mean of x; ybar = mean of y.

I'll let you take it from here. (Once you calculate the predicted y formula, substitute 293 for x in the formula to predict Jane's final exam score.)

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