The following data give SAT mean scores for math by state for 1989 and 1999 for 20
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Assuming that the samples come from a normal distribution:
(a) Test that the mean SAT score for math in 1999 is greater than that in 1989 at α = 0.05. Assume the variances are equal.
(b) Test for the equality of the variances at α = 0.05.
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a vs Since the variances are equal and unknown Rejection region is Since th...View the full answer
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Related Book For 
Mathematical Statistics With Applications In R
ISBN: 9780124171138
2nd Edition
Authors: Chris P. Tsokos, K.M. Ramachandran
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