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小果子 发表于 2008-5-5 11:13

每日一练F2 答案回复可见

<p>Regression analysis is being used to find the line of best fit (y = a + bx) from five pairs of data. The calculations have<br/>produced the following information:<br/>Σx = 129&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;Σy = 890&nbsp;&nbsp;&nbsp; &nbsp;Σxy = 23,091&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;Σx2 = 3,433&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Σy2 = 29,929<br/>What is the value of ‘a’ in the equation for the line of best fit (to the nearest whole number)?<br/>A&nbsp; &nbsp;146<br/>B&nbsp;&nbsp; 152<br/>C&nbsp;&nbsp; 210<br/>D&nbsp; &nbsp;245</p><p>A</p>

wispydog 发表于 2008-5-28 18:08

a

fjj52 发表于 2009-1-15 09:11

X

X

365day 发表于 2009-1-20 14:29

<p>我又来了</p>

guying 发表于 2009-2-25 22:43

a

amandag 发表于 2009-3-12 22:00

:)

丫头爱永恒 发表于 2009-3-29 18:38

.。。

妖精宝气 发表于 2009-4-2 22:46

have a look

红色的枫叶 发表于 2009-4-9 17:17

谢谢

North_Pole 发表于 2009-4-10 15:15

o

yueyue1985 发表于 2009-4-12 19:51

hey

xiaofei240 发表于 2009-4-28 22:15

a……算死了

wendyxia 发表于 2009-7-15 11:28

a

sese1028 发表于 2009-7-15 16:15

q

rene_12311 发表于 2009-10-23 09:23

a

tonyyuan 发表于 2010-8-26 10:03

A

lihaohao 发表于 2011-5-13 16:39

b

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