CFA Practice Question

CFA Practice Question

Which of the following is incorrect?
A. Increase in reliability factor results in increase of width of confidence interval for a sample mean.
B. Increase in sample standard deviation results in increase of width of confidence interval for a sample mean.
C. A 99% confidence interval will be narrower than a 95% confidence interval.
Explanation: A 99% interval has to contain more probability than the 95% interval, so must be wider.

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