- 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**

Which set of circumstances is most likely to result in a narrow confidence interval?

A. large n and a degree of confidence of 0.95

B. large n and a degree of confidence of 0.99

C. small n and a degree of confidence of 0.95

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**User Contributed Comments**
3

User |
Comment |
---|---|

danlan |
The smaller the confidence coefficient, the narrower interval is; The larger sample size is, the narrower interval is. |

homersimpson |
to be more precise (narrower confidence level), the probability of type 1 error increases |

homersimpson |
we have to be less sure to be sure! |