Merge pull request #58 from brymz/Statistics-1

add Statistics-1-R.md

exercises/Statistics-1-R.md

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+---
+layout: exercise
+title: Statistics 1
+language: R
+---
+
+This is a follow up to the [Graphing 1]({{ site.baseurl }}/exercises/graphing-1-R).
+
+We've graphed the relationship between adult size and new born size in
+mammals and now it's time to analyze the relationship statistically.
+
+1.  Do a regression where x is log10(adult mass) and y is log10(newborn mass)
+2.  Print the summary statistics for this regression
+3.  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)*