Part I: Two different firms design their own version of the same aptitude test, and a psychologist administers both versions to the same randomly selected subjects with the results given below. At the .05 significance, test the clam that both versions produce the same mean. Assume both populations are normal.
|Test B (After)||102||115||107||116||104||91||113||112||112|
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Part II Construct a 95% confidence interval for Ud, the mean difference of the before minus the after times. Interpret the interval in a complete sentence.
The difference of true means lieing between -3.138 to 11.318.
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