In an experiment to compare bearing strengths of pegs insertedin two different types of
Chapter 9, Problem 83(choose chapter or problem)
In an experiment to compare bearing strengths of pegs insertedin two different types of mounts, a sample of 14 observationson stress limit for red oak mounts resulted in a sample mean andsample standard deviation of 8.48 MPa and .79 MPa, respectively,whereas a sample of 12 observations when Douglas firmounts were used gave a mean of 9.36 and a standard deviationof 1.52 (Bearing Strength of White Oak Pegs in Red Oak andDouglas Fir Timbers, J. of Testing and Evaluation, 1998,109114). Consider testing whether or not true average stresslimits are identical for the two types of mounts. Compare dfsand P-values for the unpooled and pooled t tests.
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