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[主观题]

When an analyst is unsure of the underlying population distribution, which of the following is least likely to increase the reliability of parameter estimates?

A、Increase in the sample size

B、Use of point estimates rather than confidence intervals

C、Use of the t-distribution rather than the normal distribution to establish confidence intervals

答案
B
解析:“Sampling and Estimation,” Richard A. DeFusco, Dennis W. McLeavey, Jerald E. Pinto, and David E. Runkle
2012 Modular Level I, Vol. 1, pp. 562–566
Study Session 3-10-h, i
Distinguish between a point estimate and a confidence interval estimate of a population parameter.
Describe the properties of Students t-distribution and calculate and interpret its degrees of freedom.
B is correct. Point estimates are not as reliable as confidence interval estimates. A conservative approach to confidence intervals relies on the t-distribution rather than the normal distribution, and use of the t-distribution will increase the reliability of the confidence interval. Increasing the sample size increases the reliability of the confidence interval.
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