STAT 2040 Lecture Notes - Prostate Cancer, Simple Random Sample, Interquartile Range

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12 Aug 2013
Department
Course
Professor
STAT*2040 W12
Test 1 (White Version)
February 15 2012
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University of Guelph
Department of Mathematics and Statistics
STAT*2040
Statistics I
Test 1 (White version)
February 15 2012
Examiner: Jeremy Balka
This exam is 70 minutes in duration
Name:
ID:
Signature:
Please read the instructions:
1. Fill out your name and ID number above.
2. When the examination starts, make sure your question paper is complete. You should have 22
multiple choice questions, along with a formula sheet and standard normal tables. The first
question is just a bookkeeping question, and does not count for marks, but please fill it in to ensure
your exam is properly graded.
3. Do all rough work on this paper.
4. You are allowed to bring in a calculator, and pens and pencils.
5. There is only one correct answer for each question. Fill in only one bubble for each question.
6. Fill out the computer answer sheet in pencil as you go. There will be no extra time given at the
end of the exam to fill in the sheet.
7. The answers given in the exam are often rounded versions of the correct answer. Choose the
closest value.
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1. The colour of the first page of this examination booklet (the cover sheet) is:
(a) White
(b) Yellow
2. A study investigated the effect of a regular dose of aspirin on the risk of strokes. Physicians
randomly assigned approximately 5,000 volunteers to a group that took an aspirin every second
day, and 5,000 to a control group that took a placebo instead. The volunteers were followed
for several years, and researchers compared the rate of strokes in the two groups. Consider the
following statements.
I. This is an experiment, not an observational study.
II. The response variable is aspirin use.
III. This type of study cannot possibly yield evidence of a causal link between aspirin use and
rate of strokes.
Which of these statements are true?
(a) Just I.
(b) I and III.
(c) II and III.
(d) All of them.
(e) None of them.
3. Consider the following sample of 4 observations: 8,12,16,31.
What is the value of the sample variance?
(a) 11
(b) 16
(c) 29
(d) 112
(e) 258
3 of 9
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