A) Comment on the difference between the estimated coefficients for the pigmeat variable for the simple linear regression model and the multiple linear regression model. Do you reject the null hypothesis that pigmeat does not have an effect on the ozone in both models? Why do you observe a difference regarding the pigmeat variable in both models?

B) By looking at the scatterplot, does the variance of the error term look constant or not?

C)What is the consequence for the hypothesis testing (t-tests and F-tests) if one finds that the variance of the error term is non-constant?

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