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STAB22 Past Midterm 05
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University of Toronto ScarboroughSTAB22 Midterm Examination
October 2009
For this examination, you are allowed one handwritten letter-sized
sheet of notes (both sides) prepared by you, a non-programmable,
non-communicating calculator, and writing implements.
This question paper has 14 numbered pages; before you start,
check to see that you have all the pages. There is also a signature
sheet at the front and statistical tables at the back.
This examination is multiple choice. Each question has equal
weight. On the Scantron answer sheet, ensure that you enter your
last name, first name (as much of it as fits), and student number
(in “Identification”).
Mark in each case the best answer out of the alternatives given
(which means the numerically closest answer if the answer is a
number and the answer you obtained is not given.)
Before you begin, check that the colour printed on your Scantron
sheet matches the colour of your question paper. If it does not,
get a new Scantron from an invigilator.
Also before you begin, complete the signature sheet, but sign it
only when the invigilator collects it. The signature sheet shows
that you were present at the exam.
1
, 1. Look at the experiment depicted below.
Treatment 1
Mike, Joe, Mary, Jill ----- record results
/
Subjects: /
Mike, Joe, Mary, Jill \
\
Treatment 2
Mike, Joe, Mary, Jill ----- record results
Who is Mike matched with?
(a) Mary
(b) treatment one
(c) himself
(d) treatment two
(e) both treatments one and two
2. The scatterplot below shows the association between a variable x and a variable y, with the regression
line superimposed. Use the scatterplot to answer this question and the one following.
How would you describe the point with x = 400?
(a) Having a large negative residual
(b) Influential
(c) Outlier
3. In the scatterplot of Question 2, what would happen if the point with x = 400 were removed?
(a) The slope must become less
(b) The slope would not change
(c) The correlation must become lower
(d) The slope must become greater
2
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