Which of the following is an assumption underlying the use of the t-distribution ?
Correct answer: A. The sample are drawn from a normally distributed population.
- A. The sample are drawn from a normally distributed population.
- B. The variance of the population is known
- C. All above
- D. s (sample standard deviation) is an unbiased estimate of the population variance.
Explanation
The usual t procedure assumes that the sample comes from a normally distributed population, especially for small samples. The population variance is unknown, while s², not s itself, is an unbiased estimator of the population variance.
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