If a 95% confidence level is used, what is α?

Prepare for the Quantitative Business Analysis Exam 3 with interactive quizzes and comprehensive explanations. Dive into multiple choice questions that will help solidify your understanding and boost your confidence before test day!

Multiple Choice

If a 95% confidence level is used, what is α?

Explanation:
The key idea is that the confidence level and the significance level are complementary: Confidence level = 1 minus α. So a 95% confidence level means you’re allowing a 5% chance of error in the long run. In a two-sided interval, that 5% is split between the two tails (2.5% in each tail), but the total α remains 0.05. Therefore α equals 0.05.

The key idea is that the confidence level and the significance level are complementary: Confidence level = 1 minus α. So a 95% confidence level means you’re allowing a 5% chance of error in the long run. In a two-sided interval, that 5% is split between the two tails (2.5% in each tail), but the total α remains 0.05. Therefore α equals 0.05.

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