CFA Practice Question

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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.

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
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