QUESTION 27 Which of the following statements stated below is precisely correct? OA The curve of t-distribution has more variance than a normal distribution, even though they are similar. OB. The t-distribution is used when the population standard deviation is unknown. C. Both the Z-distribution and t-distribution are used to find the area under the curve for the normal distribution of sample means. D. Answers A and C are the right answer choices for this question. OE Answers A, B, and C are the right answer choices for this question.

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