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midterm1_2009_v1

# midterm1_2009_v1 - STAT 512 MIDTERM I FALL 2009 Sep 30th...

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STAT 512 MIDTERM I, FALL 2009 Sep 30 th , 2009 15 pt total 1. This exam is open-book and open-notes. 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. (8pt) Consider the following output for the diamond price vs. weight (in carats)

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