Asked by Maya
this is the Estimated regression equation i produced: ŷ= 1.68 - 4.39 x
im not sure but i interpreted as it would indicate that for every hour spent studying per week, the students grade percentage increases by 4.39%.
so my question is i have to calculate the predicted grade for a student who studies 15 hours per week. Im confused because when I plug 15 for x, the students grade percentage is 64.17% and that seems too low for someone who studies 15 hours a week?
im not sure but i interpreted as it would indicate that for every hour spent studying per week, the students grade percentage increases by 4.39%.
so my question is i have to calculate the predicted grade for a student who studies 15 hours per week. Im confused because when I plug 15 for x, the students grade percentage is 64.17% and that seems too low for someone who studies 15 hours a week?
Answers
Answered by
Reiny
First of all I would question the validity of that equation.
Surely it would have to be something like ŷ= 1.68 + 4.39 x
The way you have it, would mean that the more he studied, the lower the grade !!
Secondly, I don't see how you got 64.17
If you used your equation it would be 1.68 - 4.39(15) = -64.17
Did you just ignore the negative?
Had you used the more probable ŷ= 1.68 + 4.39 x
you would get 1.68 + 4.39(15) = 67.53
Where did this equation come from ?
Surely it would have to be something like ŷ= 1.68 + 4.39 x
The way you have it, would mean that the more he studied, the lower the grade !!
Secondly, I don't see how you got 64.17
If you used your equation it would be 1.68 - 4.39(15) = -64.17
Did you just ignore the negative?
Had you used the more probable ŷ= 1.68 + 4.39 x
you would get 1.68 + 4.39(15) = 67.53
Where did this equation come from ?
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