Mike D. answered • 05/26/21
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Experienced high school discrete math teacher
If you compare Jan to Feb, Feb to Mar ... the difference between months is not constant so you can not directly find a line y = mx + b.
You can put the values into Desmos and do a linear regression, giving y = 57.89 x + 192.107 for the regression line, then put x=12 into this to predict December
to do the regression create a table in desmos, x = 1, 2, ... 8. y = 120, 315 ....
then type y1 ~ mx1 + b1 in the next line and read off m, b .
then y = mx + b
Mike D.
Alternative method. Add up the differences between Jan Feb, Feb Mar ... and take their mean. That gives 91. Then estimate using 848 + 3 x 91 = 1121.
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05/26/21
Mike D.
The residuals for the regression plot actually are not randomly distributed suggesting that the regression model is not the best one
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05/26/21
Gary H.
thank you but the answer says its about 1100? The answer you provided gave me an answer of 886.7805/26/21