小卒資訊論壇 - Powered by Discuz! Board

標題: [M1] M1 2013 dse question [打印本頁]

作者: abcdef12345678 時間: 2014-3-9 01:04 PM 標題: M1 2013 dse question

[img]

[/img] [img]

[/img]question 12/(c)(ii)in the marking scheme the standard deviation used is 0.8, but a sample of 20 is drawn, so why the standard deviation is not 0.8/(20)^(1/2) 既係why not (8 / square root 20) ?

[ 本帖最後由 abcdef12345678 於 2014-3-14 12:08 AM 編輯 ]

作者: kcleung 時間: 2014-3-9 03:00 PM

You have confused the concept of the statistics of an observation with that of the sample mean!

引用:

原帖由 abcdef12345678 於 2014-3-9 01:04 PM 發表 http://s30.postimg.org/lar2xj2ql/question.jpg question 12/(c)(ii)in the marking scheme the standard deviation used is 0.8, but a sample of ...

作者: sumiyue 時間: 2014-3-16 08:36 PM 標題: ffffffffffff

nnnnnnnnn

作者: ykcheung 時間: 2014-5-8 02:05 PM

thank you

歡迎光臨小卒資訊論壇 (http://www.lsforum.net/board/)