What problem is presented in the regression analysis? How to correct this proble

Question

What problem is presented in the regression analysis? How to correct this problem? d). The scatter plot of a data set. There is a nonlinear trend in the plot. Fit a simple linear regression using x vs y. The output is following. The ANOVA table. The R^2= 0.63. R^2_adj = 0.54 Here, the simple linear regression model is not appropriate to analyze the relationship between x and y since there is a curve pattern in the scatter plot. Then, variable x^2 is added to the model. The multiple linear regression output. The R^2 = 0.94. R^2_adj = 0.908

Explanation / Answer

You are correct. This is a problem of UNDERFITTING.

We must use higher powers of variable to get a good fit.

But if you are adamant on using using regression you have to UNDERFIT the data,

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