Name: Concrete Strength


Abstract: The compressive strength, in pounds per square inch (psi), of 40 samples of concrete was measured at 2, 7, and 28 days after pouring.


Variables (column):

  1. Sample (1-40)
  2. Compressive Strength after Two Days (psi)
  3. Compressive Strength after Seven Days (psi)
  4. Compressive Strength after Twenty-Eight Days (psi)



Possible Uses: Matched Pairs


References: Levine, David, Patricia Ramsey, and Robert Smidt.  Applied Statistics for Engineers and Scientists.  Upper Saddle River, NJ: Prentice Hall 2001.