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CA (538,597)
Ryerson (30,392)
QMS (276)
QMS 102 (188)
Clare Chua (18)
Lecture

Lecture 3

6 Pages
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Department
Quantitative Methods
Course Code
QMS 102
Professor
Clare Chua

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1
Announcement
QUIZ 1
Quiz 1 is on next week (held in class). Check the date
on the handout agenda.
Topics that will be tested in quiz #1:
i
)
Data t
yp
es/ measurement scales
)yp
ii) Stem and Leaf Display
iii) Frequency Distribution
iv) OGIVE
Format of the Quiz1: Multiple Choice Question
Announcement
â€¢Quiz 1 â€“next class
â€¢Time â€“ 45 minutes
â€¢One page crib sheet (letter size, both sides), handwritten
or typewritten.
â€¢Calculator (learn to use the sorting function at this point)
â€¢You must have
y
our Photo ID to write
y
our
q
uiz.
y
yq
â€¢Wait outside the room until you are asked to come in.
on the scantron sheet). No ink marking, please!
â€¢Have an eraser too.
â€¢NOTE: Please use the course email account:
[email protected]yerson.ca if you wish to contact me.
â€¢Emails send to my personal account will not receive
In Lectures 1 & 2, we
have covered
1
Measurement Scales
1
.
Measurement
Scales
2. Stem and Leaf Display
3. Frequency Distribution
Coverage of todayâ€™s lecture
1. Graphing Frequency Distribution
(lecture 2 PowerPoint slides)
2. Different t
yp
es of
g
ra
p
hs
(
lecture 2
yp g p
(
PowerPoint slides)
3. When to use CW=0.25 and 2.5?
4. Cumulative Distributions and
OGIVES
Coverage of todayâ€™s lecture
When to use CW=0.25 and 2.5?
Exercises
L = 2 H = 19
Class Width (CW)
Choose a nice
2 and under 4
4 and under 6
6and
under
Classes
How
many
C?
number:
1
2
2.5
5
6
and
under
8 and under 10
10 and under 12
12 and under 14
14 and under 16
16 and under 18
18 and under 20
C
lasses
?
9
Is it
between 5
and 10
classes
Note: Why can we use Class width 2.5?
www.notesolution.com
2
Exercises
L = 2 H = 19
Class Width (CW)
Choose a nice
number:
1
2
2.5
5
0 and under 5
5 and under 10
10 and under 15
15 and under 20
Classes How
many
Classes?
4
Too FEW!
Therefore you cannot use CW=5 to construct your frequency distribution
Exercises
L = -20 H = 280
Class Width (CW) =
Number of classes (k) =
Construct the classes and boundaries
Exercises
L = -20 H = 280
Class Width (CW)
Total width
=
(280
â€“
(
-
20 )
=
300
Total
width
(280
(
20
)
300
CW = 300/5 = 60
Choose a nice
number: 10
20
25
50
100
200
250
500
Exercises
Choose a nice -50 and under 0
0 and under 50
Classes How
many
C?
â€¢L = -20 H = 280
â€¢Class Width (CW)
number: 50 and under 100
100 and under 150
150 and under 200
200 and under 250
250 and under 300
C
lasses
?
7
Is it
between 5
and 10
Classes?
10
20
25
50
Exercises
Choose a nice -100 and under 0
0 and under 100
Classes How
many
C?
â€¢L = -20 H = 280
â€¢Class Width (CW)
number: 100 and under 200
200 and under 300
C
lasses
?
4
Is it
between 5
and 10
Classes?
100
200
250
500
TOO FEWS!
Selecting a nice number for CW
1
2
2.5
5
If the data has at least one decimal
5
Data with one decimal, e.g. 1.4 14.9 4.6 11.7 8.7
You can use either 2.5 or 5.0. BUT you have to check that
the number of classes are between 5 and 10 (according to
guideline)
L = 1.4 and H=14.9Estimated CW = (14.9-1.4)/ 5 = 2.7
Estimated CW = 2.7 falls between 2.5 and 5
www.notesolution.com

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Description
Announcement Announcement Quiz 1 next class QUIZ 1 Time 45 minutes Quiz 1 is on next week (held in class). Check the date on the handout agenda. One page crib sheet (letter size, both sides), handwritten Topics that will be tested in quiz #1: or typewritten. Calculator (learn to use the sorting function at this point) i)) Datypes/ measurement scales You must haveur Photo ID tyourquiz. ii) Stem and Leaf Display Wait outside the room until you are asked to come in. iii) Frequency Distribution Scantron sheet (bring a pencil to bubble your answers on the scantron sheet). No ink marking, please! iv) OGIVE Have an eraser too. NOTE: Please use the course email account: Format of the Quiz1: Multiple Choice Question [email protected] you wish to contact me. Emails send to my personal account will not receive a reply. In Lectures 1 & 2, we Coverage of todays lecture have covered 1. Graphing Frequency Distribution (lecture 2 PowerPoint slides) 2. Differentypes ofgraphs ((lecture 2 1. Meeaasuurreme entt Sccalles PowerPoint slides) 2. Stem and Leaf Display 3. When to use CW=0.25 and 2.5? 4. Cumulative Distributions and 3. Frequency Distribution OGIVES Exercises Coverage of todays lecture L = 2 H = 19 When to use CW=0.25 and 2.5? Classes Class Width (CW) 2 and under 4 How 4 and under 6 Choose aice 6 and under88 many number: 8 and under 10 Classes? 1 9 2 10 and under 12 2.5 12 and under 14 Is it 5 14 and under 16 band 10 5 16 and under 18 classes 18 and under 20 Note: Why can we use Class width 2.5? 1 www.notesolution.comExercises Exercises L = 2 H = 19 L = -20 H = 280 Class Width (CW) Class Width (CW) = Choose a nice Number of classes (k) = number: How Construct the classes and boundaries 1 Classes 2 many 2.5 0 and under 5 Classes? 5 and under 10 5 10 and under 15 4 15 and under 20 Too FEW! Therefore you cannot use CW=5 to construct your frequency distribution Exercises Exercises L = -20 H = 280 L = -20 H = 280 Class Width (CW) Classes Class Width (CW) -50 and under 0 How many Toallwidh = 2880 (20 ))300 Choose a nice 0 and under 50 number: 50 and under 100 Classes? ? CW = 300/5 = 60 10 100 and under 150 7 20 150 and under 200 Choose a nice Is it n
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