/* Exercise 2.4 Statistical Methods in Biology: Design and Analysis of Experiments and Regression by S.J. Welham, S.A. Gezan, S.J. Clark & A. Mead (2014) Chapman & Hall/CRC Press, Boca Raton, Florida. ISBN: 978-1-4398-0878-8 Version 1, 22/09/2014 */ * Read data - change directory to location of your data file; data CARBON; infile 'C:\stats4biol\data\CARBON.DAT' firstobs=2 expandtabs; input Sample Field Carbon; run; * Sample statistics by Field; proc means data=CARBON mean var; by Field; var Carbon; run; * Two-sample t-test; proc ttest data=CARBON sides=2; class Field; var Carbon; run;