Correct answer: (A) Increase both sample sizes from 100 to 1000; (B) Increase significance level α from 0.01 to 0.2
Explanation
Increasing sample size reduces standard error and makes a fixed true mean difference easier to detect. Increasing α enlarges the rejection region, raising power at the cost of a higher type-I-error probability. Decreasing either sample size or α has the opposite effect. Thus A,B.
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