This is a follow up to the Graphing - Adult Size vs. Newborn Size problem.

We’ve graphed the relationship between adult size and new born size in mammals and now it’s time to analyze the relationship statistically.

- Do a regression where x is log10(adult mass) and y is log10(newborn mass)
- Print the summary statistics for this regression
- Make a graph that shows both the data points and the regression line through those points. Label the axes

*Optional: If you want, plot a histogram of the residuals of the regression to
make sure that they are roughly normally distributed (you can do this with just
a single line of code)*