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stats example 3
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Lecture notes of 8 pages for the course Statistics at UCalgary (3)
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Benjamin Odei F2021STAT213Assignment 5 is due on Monday, November 15, 2021 at 11:59pm.
The number of attempts available for each question is noted beside the question. If you are having trouble figuring out your error, you
should consult the textbook, or ask a fellow student, one of the TA’s or your professor for help.
There are also other resources at your disposal, such as the Mathematics Continuous Tutorials. Don’t spend a lot of time guessing – it’s
not very efficient or effective.
Make sure to give lots of significant digits for (floating point) numerical answers. For most problems when entering numerical answers,
you can if you wish enter elementary expressions such as 2 ∧ 3 instead of 8, sin(3 ∗ pi/2)instead of -1, e ∧ (ln(2)) instead of 2, (2 +
tan(3)) ∗ (4 − sin(5)) ∧ 6 − 7/8 instead of 27620.3413, etc.
Problem 1. (1 point) Problem 2. (1 point)
For each problem, select the best response. Popular magazines rank colleges and universities on their aca-
demic quality in serving undergraduate students. Below are sev-
(a) A description of different houses on the market includes the eral variables that might contribute to ranking colleges. Which of
following three variables. Which of the variables is quantitative? these are categorical and which are quantitative? Write ”QUAN-
TITATIVE” for quantitative and ”CATEGORICAL” for categori-
• A. The school district. cal (without quotations).
• B. The street number.
• C. The monthly electric bill. (a) The kinds of sports teams at the college.
• D. The exterior paint colors. Answer:
• E. None of the above.
(b) Require SAT or ACT for admission (required, recommended,
(b) A professor records the values of several variables for each not used)?
student in her class. These include the variables listed below. Answer:
Which of these variables is categorical?
(c) Percent of freshmen who eventually graduate.
Answer:
• A. Final grade for the course (A, B, C, D, or F).
• B. Score on the final exam (out of 200 points).
(d) Mean faculty salary.
• C. The number of lectures the student missed.
Answer:
• D. The total number of points earned in the class (i.e., the Answer(s) submitted:
total of the points on all exams and quizzes in the course.
•
The maximum number of points possible is 500). •
• E. None of the above. •
•
(c) A description of different houses on the market includes the (incorrect)
following three variables. Which of the variables is quantitative?
• A. The school district.
• B. The street number.
• C. The monthly electric bill.
• D. The exterior paint colors.
• E. None of the above.
Answer(s) submitted:
•
•
•
(incorrect)
1
, Problem 3. (1 point) Problem 4. (1 point)
Below is a bar graph of class standing for a Finance seminar con- For each problem, select the best response.
taining five students who are either freshman, sophomores, ju-
niors, or seniors. In the bar graph the bar for the juniors has been (a) A study of the effects of running on personality involved 231
omitted. (Click on the image for a larger view. ) male runners who each ran about 20 miles a week. The runners
were given the Cattell Sixteen Personality Factors Questionnaire,
a 187-item multiple-choice test often used by psychologists. A
news report (The New York Times, Feb. 15, 1988) stated, The
researchers found statistically significant personality differences
between the runners and the 30-year-old male population as a
whole. A headline on the article said, Research has shown that
(a) The percentage of students in the seminar who are not juniors running can alter one’s moods. This study was
is
• A. an observational study, but not an experiment.
• A. 80% • B. a randomized, double-blind experiment.
• B. 20% • C. an experiment, but not a double-blind experiment.
• C. 40% • D. a double-blind experiment, but not a randomized ex-
• D. 60% periment.
• E. None of the above.
(b) Can pleasant aromas help a student learn better? Two re-
(b) The number of students in the seminar who are juniors is searchers believed that the presence of a floral scent could im-
. prove a person’s learning ability in certain situations. They had
Answer(s) submitted: twenty-two people work through a pencil and paper maze six
• times, three times while wearing a floral-scented mask and three
• times while wearing an unscented mask. The three trials for each
(incorrect) mask closely followed one another. Testers measured the length
of time it took the subjects to complete each of the six trials. They
reported that, on average, the subjects wearing the floral-scented
mask completed the maze more quickly than those wearing the
unscented mask, though the difference was not statistically signif-
icant. This study is
• A. a convenience sample.
• B. a double-blind experiment.
• C. an experiment, but not a double-blind experiment.
• D. an observational study, but not an experiment.
Answer(s) submitted:
•
•
(incorrect)
2
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