After showing dianne these plots, john reminds dianne of the four conditions for a linear model. a linear relationship exists between the predictor variable and the response variable. the response variable is distributed normally about the regression line. the individual observations are independent of each other. the response variable has approximately the same standard deviation for each fixed value of the predictor variable. based on the plots and necessary conditions for linear modeling, what should dianne tell john about the validity of his linear model?