Consider the following summary data on the modulus
Chapter 10, Problem 5(choose chapter or problem)
Consider the following summary data on the modulus ofelasticity (3 106 psi) for lumber of three different grades[in close agreement with values in the article BendingStrength and Stiffness of Second-Growth Douglas-FirDimension Lumber (Forest Products J., 1991: 3543),except that the sample sizes there were larger]:Grade J xi. si1 10 1.63 .272 10 1.56 .243 10 1.42 .26Use this data and a significance level of .01 to test thenull hypothesis of no difference in mean modulus ofelasticity for the three grades.
Unfortunately, we don't have that question answered yet. But you can get it answered in just 5 hours by Logging in or Becoming a subscriber.
Becoming a subscriber
Or look for another answer