[討論] 生統答案
幫班代po
(1)population之mean = 6
population之variance = 8
(2)sample mean 為 2+2/2=2，2+4/2=3，2+6/2=4，2+8/2=5，2+10/2=6...依此類推
所以sample mean有2,3,4,5,6,3,4,5,6,7,4,5,6,7,8,5,6,7,8,9,6,7,8,9,10等25個
sample mean 之mean =2+3+4+5+6+3+4+5+6+7+4+5+6+7+8+5+6+7+8+9+6+7+8+9+10/25
= 6
sample mean 之variance = ....= 4 (...自己算啦)
(3) sample mean 之mean = 6 = population之 mean
sample mean 之variance = 4 = 8/2 = population之variance/抽樣數n
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 220.141.33.73
推
10/14 01:54, , 1F
10/14 01:54, 1F