Graph Building
Name three graphs we worked on this unit
double bar graphs
stem and leaf plots
dot plots
Describe Frequency
a count of categorized data…but it is not the data value itself.
It’s how often that data value occurs in the DATA SET
A survey was conducted to show favourite foods.
16 people chose pizza
12 people chose cheeseburgers
15 people chose pasta
What food was the most popular
pizza
What types of things can we learn from categorical data?
Various responses accepted
Determine the frequency...(draw tally marks on board)
Yay!
Reading the same survey question as above, how many people participated?
16 people chose pizza
12 people chose cheeseburgers
15 people chose pasta
43
Double bar graphs facilitate comparisons across groups and help to highlight trends and differences.
Ex: comparing answers to the same survey from different grades
Build a frequency table for the below data
5, 6, 7, 5, 8 , 6, 6
See whiteboard response
What is mode?
The mode is the category with the HIGHEST frequency!
16, 12, 9, 5, 12, 22
See Response
Use the last group's frequency table to build a dot plot
See whiteboard response
What is the mode of the below data? and why?
11, 7, 8, 8, 7, 9, 10, 10, 7, 8, 9, 9, 8, 11, 9, 8
Eight
What are the axes called on a graph? Can you label them?
X-axis = horizontal
Y-axis = vertical
Identify the STEMS and Leafs
145
16
9
Stems: 0, 1, 14
Leafs: 5, 6, 9
View the stem and leaf plot on the board and interpret that data
See responses