- CFA Exams
- CFA Level I Exam
- Topic 1. Quantitative Methods
- Learning Module 5. Sampling and Estimation
- Subject 2. The Central Limit Theorem

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**CFA Practice Question**

Which of the following is the central limits theorem?

A. For any distribution with mean = M and standard deviation = SD, there is approximately 1 - 1/SD proportion of the data within 1 standard deviation of the mean.

B. For large sample sizes (n > 30) from any (large/infinite) population, the distribution of the sample averages, x-bars, is approximately normal with mean the same as that of the population and standard deviation that of the population divided by the square root of n.

C. For a normal distribution, approximately 68% of the data is within 1 standard deviation of the mean.

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**User Contributed Comments**
2

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

toyo |
N=no of sample (eg.apply 100pax out of 10000pax) sample mean=population mean (eg. aveg time) sample variance=population variance/N sample standard deviation=population standard deviation/square root of N |

davcer |
the other two refer to chebyshev |