UNIVERSITY OF TORONTO
Faculty of Arts and Science
PRACTICE EXAMINATION
STA220H1F
Duration - 3 hours
AIDS ALLOWED: (to be supplied by the student)
Non-programmable calculator
One handwritten 8.5' x 11' aid sheet (both sides may be used)
NAME_
STUDENT NUMBE
PARTIMULTIPLECHOICEQUESTIONS
1) Theweightsofthemaleandfemalestudentsinaclassaresummarizedinthefollowing
boxplots:
WhichofthefollowingisNOTcorrect?
A)
B)
C)
D)
E)
About50%ofthemalestudentshaveweightsbetween150and185lbs.
About25%offemalestudentshaveweights
STA220 L0101/L0201 - Week 3 additional problems - solutions
1. If an individual is HIV negative (HIV-), the EIA test has probability 0.006 of
giving a positive (i.e., false positive) result. Suppose 100 people are tested
w
The Practice of Statistics 1
Week 4: Condence Intervals
Video 21: Sample Size for Estimating a Proportion
The goal of this lecture is to learn how to determine the sample size needed to estimate a
proportion. When planning any study, determining the numbe
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Prep101Stats220MTSolutions
I. Descriptive Statistics
1.
a)
Skewed right (positively)
b)
Q1 = 45,700 Q3 = 46,700 IQR = 1000 Q3 + 1.5 IQR = 48,200 , so the two salaries
above 50,000 would be flagged.
c)
46,400
d)
False, since right skewness implies mean > m
STA220H Term Test Oct 23, 2003
Last Name:_ First Name:_ Student #:_
TAs Name:_ or Tutorial Room: _ Day/Time:_
Time allowed: 1 hour, 45 minutes. Check that you have all the consecutively numbered
pages of this test.
Aids: one sided handwritten aid sheet +
STA220H Term Test Oct 21, 2004
Last Name: _ First Name:_ Student #:_
TAs Name: _ or Tutorial Room: _ Day/Time:_
Time allowed: 1 hour, 45 minutes. Check that you have all the consecutively numbered pages of this test.
Aids: one sided handwritten aid sheet
STA220H1F Term Test Oct 26, 2005 - Solutions
Last Name:_ First Name:_ Student #:_
TAs Name:_ or Tutorial Room: _
Time allowed: 1 hour and 45 minutes.
Aids: one sided handwritten aid sheet + non-programmable calculator
Statistical table(s) are attached at
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Unauthorized reproduction/distribution is strictly prohibited.
Solution (if any) is NOT audited, so use at your discretion.
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STA220H Practice Test I - Solutions
1) The life span of the Everun Battery used in the EL-506L calculator is normally distributed with a mean of
3.5 years and a standard deviation of 0.5 year.
a) What is the probability that a randomly chosen Everun Batte
1] Below is a display oftypical travel times to school for a random sample of40 Ontario
secondary school students:
Stemandleaf of Time N = 40
Leaf Unit = 1.0
l 0 2
9 0 55557888
16 1 0000023
(7) 1 5555578
17 2 000022
11 2 5557
7 3 000
4 3 55
2 4
2 4 5
1 5
Prep101Stats220ExamSolutions
I. Descriptive Statistics
Practice Questions
1.
a)
Solution:
Skewed right (positively)
b)
Solution:
Q1 = 45,700 Q3 = 46,700 IQR = 1000 Q3 + 1.5 IQR = 48,200 , so the two salaries
above 50,000 would be flagged.
c)
Solution:
46,
The Practice of Statistics 1
Week 4: Condence Intervals
Video 22: Condence Intervals for Means
Example 1
Lets return to the face lift example we introduced in Lecture 4.1. The objective of study
was to determine how many years younger patients were percei
The Practice of Statistics 1
Week 4: Condence Intervals
Video 23: Robustness of Condence Intervals
In many inferential procedures, there are necessary conditions that must be satised in
order for the sampling distribution of our estimators to be appropria
STA220H Practice Test I - Solutions
1)
The life span of the Everun Battery used in the EL-506L calculator is normally distributed with a mean of
3.5 years and a standard deviation of 0.5 year.
a) What is the probability that a randomly chosen Everun Batte
STA220H Term Test June 6, 2006
Last Name: _First Name:_ Student #:_
TAs Name and/or Room Number: _
Time allowed: 80 minutes.
Aids: one sided handwritten aid sheet + non-programmable calculator
Check that you have all the consecutively numbered pages of th
STA220H Practice Test I
Last Name: _ First Name:_ Student #:_
Tutorial Day & Time: _TAs Name (if unknown, give your tutorial room): _
Time allowed: 1 hour, 45 minutes. Check that you have all the consecutively numbered pages of this test.
Aids: one sided
STA220H Term Test Oct 25, 2006
Last Name: _ First Name:_ Student
#:_
Tutorial Day:
Monday or Tuesday (circle one)
Tutorial Time:_ Tutorial Room:_ TAs Name: _
Time allowed: 105 minutes.
Aids: one sided handwritten aid sheet + non-programmable calculator
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STA220H1F Term Test Oct 26, 2005
Last Name:_ First Name:_ Student #:_
TAs Name:_ or Tutorial Room: _
Time allowed: 1 hour and 45 minutes.
Aids: one sided handwritten aid sheet + non-programmable calculator
Statistical table(s) attached at the end. Please
Answers to Summer 2008 Final
Multiple choice:
1
2
3
4
5
E
E
D
E
A
6
7
8
9
10
B
B
B
E
D
11
12
13
14
15
B
D
D
E
D
16
17
18
19
20
A
C
D
C
C
Long-answer:
1 a)
d.s.
no d.s.
positive
48
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negative
6
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b) 0.26
c) 0.035
2 a) 0
b) 0
c) 9604
3 a) completely r
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STATISTICS 220F - The Practice of Statistics - Fall 2010
Course homepage accessible from the U of T Portal at http:/portal.utoronto.ca
This course (in combination with STA221H) presents the basic statistical methodology used in many fields of
application.
k) Nemoo is subject number
24, i.e. in raw 24. Using the outputs above, you can discover
some things of interest about Nemoo. Explain in plain words what sets Nemoo apart from
'
f
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most of the other subjects (make reference to all variables) [2pts]
,l6
j)
Give a precise description of the distribution of the residuals (shape, centre, spread)
resulting from this regression.
,
[3pts]
^
J.rfr;btt,.n Lt ;fy,"*,^,t'/7 syr*'t'ical \^',th
&nfvt c41 0, Th. s
,.s ,^"L*J,rr, ,hqA Qror^J 0
Fre,4)
Further the resea
:
Ouestion 5
or Friday each week,
Suppose a couple of your friends go to a restaurant on either Monday
the probability-of receiving
but not both. 30% of the time they go on Monday. On Mondays,
is only 0'l '
good seririce is 0.8. On Fridays, irobuUility of
Ouestion 3
A professor is considering which of two exams to give. Scores on the first exam follow a normal
distribution with mean of 75 and standard deviation 5. Scores on the second exam follow a
normal distribution with mean of 75 and standard deviation
d)
Three students have been randomly (independently) selected from the class, what is the
probability that the scores of all of them on the cfw_irst exam are at the 70th percentile or
higher? [2pts]
a
Z-e)
In the first exam, what is the probability that a
Ouestion 6
(i) In 1976, the advice columnist Ann Landers asked readers of her column to respond the
following question: "If you had to do tt again, would you have children? " She received over
10,000 responses, 80% from women. About 70% of he respondents