[2008 CFA level 1模拟真题]Version 1 Questions－Q10 level

8586

10、Which of the following changes in sample size and degrees of freedom, respectively, is most likely to result in an increase in the width of the confidence interval for the population mean?

	Sample size	Degrees of freedom
A.	Increase	Increase
B.	Increase	Decrease
C.	Decrease	Increase
D.	Decrease	Decrease

A. Answer A

B. Answer B

C. Answer C

D. Answer D

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Correct answer = D

"Sampling and Estimation," Richard A. Defusco, Dennis W. McLeavey, Jerald E. Pinto, and David E. Runkel
2008 Modular Level I, Vol. 1, pp. 440-441
Study Session 3-10-j
calculate and interpret a confidence interval for a population mean, given a normal distribution with 1) a known population variance, 2) an unknown population variance, or 3) an unknown variance and a large sample size
The standard error becomes smaller as the sample size increases. An increase in sample size increases degrees of freedom, reducing the reliability factor. A reduction in both the standard error and the reliability factor decrease the width of the confidence interval. A decrease in both would increase the width. 

cxz0858

A

rwangy

3x

zjy1228

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zhangxie83

c

Riverview

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刀剑如梦

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gening

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盛夏的果实

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