As long as your sample is large enough, you don't have to worry about using the sample standard deviation in place of the unknown population standard deviation in constructing a confidence interval because ________.

A. for low degrees of freedom, the t-distribution is similar to the standard normal distribution
B. the sample standard deviation is an efficient estimator of the population standard deviation
C. for all degrees of freedom, the t-distribution is bell-shaped
D. for a large sample, the t-distribution is similar to the standard normal distribution


Answer: D

Biology & Microbiology

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