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September 3, 2015

Homework Help: mathematics

Posted by Joan on Tuesday, July 9, 2013 at 7:41am.

Hi, I'm not sure if I'm giving the correct answer for this problem. The question states; The values of computers in the years after its purchase date are listed in the following table. Year 0=1500, Year1=1200, Year2=1100,Year3 +1000, Year 4 = 800, Year 5 =400, Year 6= 200. Givent hat the equation of the regression line between value and year is y = -207.14x + 1507.14 with an R^2 value of 0.9622, how reliable do you think the regression equation is at predicting the future value of a computer in 5 years?

My answer: first I drew a scatter plot, then I got the correlation coefficient which is 0.981. I preidicted strong, negative correlation. I'm just concerned this isn't the correct procedure because the next question asks me to calculate the corrrelation coefficient between year and value which I already did for this question. Any help is greatly appreciated.

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