the subject is competing model validation

Residual Plot 8. Your friend used a set of data to create a quadratic regression model. The residual plot for his model is shown above. Based on the residual plot above, which of the following conclusions is correct? (A) The residual plot has no apparent pattern, so the quadratic model was appropriate. (B) The residual plot has no apparent pattern, so the quadratic model was not appropriate. (A) The residual plot displays a pattern, so the quadratic model was appropriate. (A) The residual plot displays a pattern, so the quadratic model was not appropriate. +15 Model Residuals Model Residuals Exponential Regal 40.3 +10 +0.3 +5 +0.1 -0.1 -10 -0.2 -15 -0.4 9. A set of data was used to create a linear, a quadratic, and an exponential regression model. The residual plots for the three models are shown above. Based on the three residual plots, which of the following could be an appropriate model for the data? (A) y= 3+2x (B) y=x' +2x+3 (C) y = 3(2)" (D) y = 3+2logx 10. Your grandpa loves to invest his money in mutual funds. Over the past twenty years, he has closely tracked how his account grows and noticed that each year his account grows by approximately 10.4%. If Grandpa wants to find a function that models the amount of money in his account over time, should he use a linear, quadratic, or exponential model? Give a reason for your answer. 11. After Grandpa creates his model from question 10, he uses the model to create a residual plot in order to check the plot? appropriateness of his model. If his model was appropriate, what should he expect to see when looking at the residual