(8) A study was done to use the GRE Quantitative scores of male students entering PhD programs to determine if they would be predictive of the student completing their PhD program. The results were as follows: n X Sx Completed PhD 9 694 83.6 Gave up PhD 7 727 73.7 (a) Find a 99% confidence interval for the difference in the average GRE Quantitative scores for males completing their PhD and those giving up. Can you assert that they are different with 99% confidence? Assume the GRE scores of both groups follow normal distributions with equal variances. (b) Test Ho 0₁ = 02 against Ho: 0₁ 02 using the significnce a = 0.1. Is the assumption in part (a) reasonable?

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A study was done to use the GRE Quantitative scores of male students entering
PhD programs to determine if they would be predictive of the student completing
their PhD program. The results were as follows:
n
X Sx
9 694 83.6
Completed PhD
Gave up PhD 7 727 73.7
(a) Find a 99% confidence interval for the difference in the average GRE Quantitative
scores for males completing their PhD and those giving up. Can you assert that
they are different with 99% confidence? Assume the GRE scores of both groups
follow normal distributions with equal variances.
(b) Test Ho 0₁ = 02 against Ho: 0₁ 02 using the significnce a =
‡
01
assumption in part (a) reasonable?
0.1. Is the
Transcribed Image Text:A study was done to use the GRE Quantitative scores of male students entering PhD programs to determine if they would be predictive of the student completing their PhD program. The results were as follows: n X Sx 9 694 83.6 Completed PhD Gave up PhD 7 727 73.7 (a) Find a 99% confidence interval for the difference in the average GRE Quantitative scores for males completing their PhD and those giving up. Can you assert that they are different with 99% confidence? Assume the GRE scores of both groups follow normal distributions with equal variances. (b) Test Ho 0₁ = 02 against Ho: 0₁ 02 using the significnce a = ‡ 01 assumption in part (a) reasonable? 0.1. Is the
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