2.100 Make some scatterplots. For each of the following scenarios, make a scatterplot with 10 observations that show a moderate positive association, plus one that illustrates the unusual case. Explain each of your answers.

1. (a) An outlier in x that is not influential for the regression.

2. (b) An outlier in x that is influential for the regression.

3. (c) An influential observation that is not an outlier in x.

4. (d) An observation that is influential for the intercept but not for the slope.