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MAP4C
UNIT 3: MATHEMATICAL MODELS
One Variable Data
 A variable is an attribute that can be measured.
 One-variable data sets give measures of one attribute.
 One-variable data can be analyzed using mean,
median and mode.
 You can recognize this when you see:
a) Tally charts
b) Frequency Tables
c) Bar Graphs
d) Histograms
e) Pictographs
f) Circle graphs
Two Variable Data
 Two-variable data sets give measures of two
attributes for each item in a sample.
 You can recognize 2-variable data when you see:
a) Ordered pairs
b) Scatter plots
c) Two column tables of values
Recognizing Data Types
 State whether each situation involves one or two-
variable data. Justify your choice.
a) Noah researches annual hours of sunshine in
Canadian cities.
b) A study compares the length of time children spend
playing video games and the time they spend
reading.
a) As this data can be analyzed with mean, median or
mode: this is 1-variable data.
b) Two pieces of information are studied and can be
plotted on a scatter plot graph. This is 2-variable data.
Deciding which type of graph to draw
 Dylan conducted a survey about students part-time
jobs:
Hours spent at Part-time Job
Student
During the week (h)
On the weekend (h)
Peeta Mellark
0.0
18.0
Katniss Everdeen
5.0
12.5
Hermione Grainger
8.0
12.0
Harry Potter
17.0
8.0
Gandalf the Grey
0.0
16.5
Dumbledore
10.0
16.0
John Crichton
9.5
8.0
Aeryn Sun
15.0
6.0
Deciding which type of graph to draw
a) What graph type would be best to show how many
hours each student worked on the weekend? Is this
1 or 2 variable data? Justify.
b) What type of graph would best show a relationship
between weekday and weekend hours worked? Is
this 1 or 2 variable data? Justify.
c) Graph each situation indicated.
d) Would you expect any correlation in the graph
from part b?