Question: Refer to Problem 19.4 Sergeant Desk believes the failures are related to reading ability. She regresses whether these same 400 troops failed (Y) on their reading test scores (X, scored in terms of school grade levels). She finds.

Y= .15 + .071X Sy/x = .06 sb= .011 r2 = .80

Interpret Desk’s regressions. Compare her argument with Brown’s. Can you reconcile them?

---- 19.4. Too many U.S army mechanics are failing their yearly skills test. Colonel Maxwell Brown believes that this failure rate results because mechanics do not learn anything from experience. His hypothesis is that time spent in occupational specialty is unrelated to performance on the exam. He regresses whether a mechanic failed the test (0= failure and 1= no failure) on the mechanics time as a mechanic (X) in years. For a sample of 400 troops.

Y = .63 + .03X Sy/x = .41 sb = .61 r squared = .09

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