30. It is the distribution used to estimate the population parameters for small sample size and when the population variance is unknown? A. z-Distribution B. t-Distribution C. Chi-Square Distribution D. Pearson Correlation Coefficient Distribution 31. Which of the following formulas is used to calculate the standard deviation of the sampling distribution of the sample mean (for infinite population) when the population standard deviation is given? N-n σ N-n A. 0x= Vn C. σ Vn+1 N-1 VN-1 B. 0x= Jn D. σε 32. A population consists 11, 19, 22, 2, 8, 9, and 15. Suppose samples of 2 are drawn from this population. This situation is an example of the sampling distribution of the sample mean for a normal population with population variance is A. unknown C. large B. known D. small

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