- CFA Exams
- CFA Level I Exam
- Study Session 3. Quantitative Methods (2)
- Reading 10. Sampling and Estimation
- Subject 6. Confidence Intervals for the Population Mean

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**CFA Practice Question**

A 95% confidence interval for a population mean will be ______ a 99% confidence interval for the same population mean. (Both calculations are based on the same set of data.)

B. shorter than

C. the same length as

D. It depends on the particular set of data

A. longer than

B. shorter than

C. the same length as

D. It depends on the particular set of data

Correct Answer: B

When the data set is the same, the length of the confidence interval depends on the z- or t-value used. This value is smaller for 95% confidence than for 99% confidence, so it will result in a smaller interval.

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