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- Make five graphs of api99: histogram, kdensity plot, boxplot, symmetry plot and
normal quantile plot.
- What is the correlation between api99 and meals?
- Regress api99 on meals. What does the output tell you?
- Create and list the fitted (predicted) values.
- Graph meals and api99 with and without the regression line.
- Look at the correlations among the variables api99 meals ell
avg_ed using the corr
and pwcorr commands. Explain how these commands are different. Make a
scatterplot matrix for these variables and relate the correlation results to the
scatterplot matrix.
- Perform a regression predicting api99 from meals and
ell. Interpret the output.
