問題詳情
15. In estimating the population mean, it is known that the necessary sample size is 150 in order to provide aparticular margin of error at 98% confidence level. With a 95% confidence level, what is the minimum samplesize that needs to be taken if the desired margin of error is balved?
(A)213;
(B)253;
(C) 427;
(D) 506.
參考答案
答案：[無官方正解]
難度：計算中-1
書單：沒有書單，新增