SampHe Exaxmixnati*rs Six - La Jolla High School
SampHe Exaxmixnati*rs Six - La Jolla High School
SampHe Exaxmixnati*rs Six - La Jolla High School
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42 Sarnple Examination <strong>Six</strong> Section E<br />
25. A study found that playing classical music increased worker productivity. Horvever, the<br />
researchers were not aware that the workers knew about the study while it rvas in<br />
progress. Since the increase in productivitl may have been due to the workers'<br />
knowledge that they were being studied, this is a potential example of<br />
(A) the control group effect<br />
(B) the effect of a treatment unit<br />
(C) a lurking variable<br />
(D) sampling effor<br />
(E) voluntary response bias<br />
26.The regression line of a set of data is y=2x+b which passes through the point (3,5).<br />
If x and y are the sample means of the x and y values, respectiveiy, then<br />
(A)<br />
(B)<br />
(c)<br />
(D)<br />
rtr)<br />
j= 2t+ 6<br />
n-.4<br />
J= zx+ I<br />
l-L^<br />
l=u<br />
y=x+o<br />
27. A straight line of the form y-- a+ bx is fitted to the 5 data points (1, 0), (0, 3), (3, 1),<br />
(2,-3), and (4,2) by the method of least squares. What is the value of 6?<br />
(A) -3<br />
(B) -2/3<br />
(c) -1lr0<br />
(D) 4/s<br />
(E) 4<br />
or<br />
any part of thls page ls lllegal.<br />
Answer<br />
Ansner<br />
Answer
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