University of Toronto Scarborough
STAB22 Final Examination
December 2010
For this examination, you are allowed two handwritten letter-sized sheets of notes
(both sides) prepared by you, a non-programmable, non-communicating calculator,
and writing impleme

University of Toronto Scarborough
STAB22 Midterm Examination solutions
June 2007
This examination contains a mixture of short-answer and multiple choice questions. For
the short-answer questions, write your answers in the spaces provided; for the multiple

University of Toronto Scarborough
STAB22 Midterm Examination
March 2008
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 implement

Chapter 12: Sample surveys
Examine a part of the whole (p.315)
Population = everyone we want to investigate.
Sample that represents/selected from population
Sample survey: ask questions of a small group of ppl in the hope of learning sth about the
entir

Chapter 6: The standard deviation as a ruler and the normal model (p. 121)
Which is the better exam score?
67 on exam A with mean 50 and SD 10
62 on exam B with mean 40 and SD 12?
What do you say to these:
67 is better because 67 > 62? No, because mean

Chapter 5: understanding and comparing data (p. 88)
Review: Data 10, 11, 14, 15, 17, 19, 21, 28, 35:
why is median 17?
N=9; medians is (9+1)/2= 5th
find Q1 and Q3
Q1= median of 10,11,14,15,17= 14
Q3= median of 17, 19, 21, 28, 35= 21
find interquartile

Things vary:
people are different
can't see everything or measure it all
what we can measure might be inaccurate
Ch 2: Data (p. 7)
Airlines monitored for safety and customer service. For each flight, carriers must report:
flight number
type of aircra

Ch 4: Displaying and summarizing quantitative data (p.49)
Distribution -> Mostly quantitative variables slices up all the possible value of the variable into
equal width bins and gives the number of values falling into each bin
Histogram
-Bins/ classes ->

Chapter 14: From randomness to probability (p. 376)
Randomness
In short term, unpredictable
In long run, predictable:
coin: should win about 1/2 of the time.
die: should win about 1/6 of the time.
Tim Horton's? Dont know
Empirical probability/ random

Chapter 11: Understanding Randomness (p.300)
What does random mean?
In short term, unpredictable
In long run, predictable:
coin: should win about 1/2 of the time.
die: should win about 1/6 of the time.
Computer random numbers generated by non-random

Week 4 9/23 Tues
Chapter 7: Scatterplots, association and correlation (p. 168)
Now look at two quantitative variables.
First tool: scatterplot.
Plot values of two quantitative variables against each other.
e.g. The airport in Oakland, California record

Chapter 13: Experiments and Observational Studies (p. 341)
How do you find out if exercise helps insomnia?
look at a bunch of people, find out if they exercise and how much, ask them to rate their
insomnia.
Suppose the people who exercise more suffer le

Chapter 3: Displaying and describing categorical data (p. 20)
In 1991 and again in 2001, a poll was taken of 1015 adults about their opinions on working
parents. The question was considering the needs of adults and children, what do you see
as the ideal f

Chapter 8: Linear regression finding the best line (p. 198)
In math, straight line relationship looks like y=a+bx
where x and y are variables, and a and b are numbers that describe what kind of straight line you
have.
a = intercept: value of y when x=0

Ladder of powers (p. 269)
Power Name
Notes
2
Square of values Left skewed
1
Unchanged data
0.5
Square root
Counted stuff; frequency
0
Logarithm
% change matters (no negative)
-0.5
+/-1/square root Rare -> direction
-1
+/-1/data
Ratio of 2 quantities wrong

Correlation and causation (p. 179)
-high correlation between #sodas sold in year and #divorces, years 1950-2010. Does that mean
that having more sodas makes you more likely to divorce?
Over that time, population increased, so changes in both variables are

UNIVERSITY OF TORONTO SCARBOROUGH
Department of Computer and Mathematical Sciences
Midterm Test June 2016
STAB22H3 Statistics I
Duration: 1 hour and 45 minutes
Last Name:
First Name:
Student number:
Aids allowed:
- One handwritten letter-sized sheet (both

University of Toronto Scarborough
STAB22 Final Examination
December 2009
For this examination, you are allowed two handwritten letter-sized
sheets of notes (both sides) prepared by you, a non-programmable,
non-communicating calculator, and writing impleme

University of Toronto Scarborough
STAB22 Final Examination
April 2009
For this examination, you are allowed two handwritten letter-sized
sheets of notes (both sides) prepared by you, a non-programmable,
non-communicating calculator, and writing implements

UNIVERSITY OF TORONTO SCARBOROUGH
Department of Computer and Mathematical Sciences
Midterm Test June 2014
STAB22H3 Statistics I
Duration: 1 hour and 45 minutes
Last Name:
First Name:
Student number:
Aids allowed:
- One handwritten letter-sized sheet (both