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Question: To calculate the confidence interval for variance or standard deviation, a statistical distribution called ______ is needed.


A ) chi-square distribution
B ) binomial distribution
C ) poisson distribution
D ) multinomial distribution

Steps to derive

1 Chi-square distribution is used to calculate the confidence interval for variance or standard deviation.

2 Binomial distribution is used to calculate the probabilities of outcomes.

3 Poisson distribution is used when the sample is large and the independent variables occur over a period of time.

4 Multinomial distribution is the generalization of the binomial distribution. Each trial in an experiment has more than two outcomes.



Hence the right answer is Option A

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