Advanced Statistics  Biology 6030 
Bowling Green State University, Fall 2017 
If two independent samples are obtained, then we can ask whether they may
have been drawn from two different underlying distributions.
First
generate a Data set n
= 50 Now plot
the data and a horizontal line at the mean plot(x,y) Calculate
the best fit model line and draw in the line fit.lm
= lm(y~x) Predict
yhats and construct confidence intervals for the slope
newx
= seq(min(x),max(x)) Get a plot of the results, for residuals vs fitted values, residuals vs independent values, a QQ plot for residuals, etc ...
