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Sep 30
th
, 2009
15 pt total
1.
This exam is openbook and opennotes. No computers/phones/wireless
communication!
2. Write your full name – I don’t want to deal with anonymous exam takers.
3. Write your solution clearly with intermediate steps instead of just the final answer.
4. Try to answer all the questions. I will not be able to give you partial credit if you do
not write anything.
5. Please write legibly. If your handwriting is difficult to read, I will not be able to
understand and give you credit.
1. (4pt) Suppose the estimated regression equation is
^
10
5
X
Y
=
+
.
If the analysis was
rerun with X replaced with U=0.5X+2, give the estimated regression equation
2. (3pt) In a simple linear regression there are two intervals associated with X = 5: (20,
29) and (15, 35). Which is the prediction interval and which is the confidence interval for
the mean response at this level of X? Explain you answer.
3.
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This note was uploaded on 02/05/2011 for the course STAT 512 taught by Professor Staff during the Spring '08 term at Purdue University.
 Spring '08
 Staff

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