Using data regression to predict sales


Assignment:

    YEAR    GNP    ln(gnp)
    1975    1060    6.966024187
    1976    1170    7.064759028
    1977    1305    7.17395832
    1978    1455    7.28276118
    1979    1630    7.396335294
    1980    1800    7.495541944
    1981    2000    7.60090246
    1982    2220    7.705262475
    1983    2450    7.803843304
    1984    2730    7.912056888
           
The US BNP during the years 1975-1984 is given in the above table.       
           
a. Plot x = years after 1974 against GNP, and use the plot to describe how to fit a curve that could be used to predict GNP during future years.   
           
b. When the regression on transformed data is done, we find the B=6.86 and B1=0.105.  What is the prediction for 1985 GNP?

Provide complete and step by step solution for the question and show calculations and use formulas.

 

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Basic Statistics: Using data regression to predict sales
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