9I Grouped Data
LEARNING INTENTIONS
To know how to use a frequency table to record data in class intervals
To be able to calculate the percentage frequency of an interval in a frequency table
To know the types of data that can be displayed in a histogram
To be able to display grouped numerical data in a histogram and interpret the graph
SUCCESS CRITERIA
I can construct frequency tables and histograms.
e.g. For the data below showing the ice-cream sales each hour of operation over a week, set up and complete a grouped frequency table using class intervals 0–, 5–, etc.
15 22 10 20 3 10 22 3 3 11 14 19 3
16 14 24 7 11 55 7 22 9 28 3 21 3
26 20 22 25 6 7 12 6 13 7 7 20 11 11From the table, construct a frequency histogram and state for how many hours there were sales of 15 or more ice-creams.
CHECKLIST
Ch 9I: 1, 3, 4, 5, 6, 8, 11
To know how to use a frequency table to record data in class intervals
To be able to calculate the percentage frequency of an interval in a frequency table
To know the types of data that can be displayed in a histogram
To be able to display grouped numerical data in a histogram and interpret the graph
SUCCESS CRITERIA
I can construct frequency tables and histograms.
e.g. For the data below showing the ice-cream sales each hour of operation over a week, set up and complete a grouped frequency table using class intervals 0–, 5–, etc.
15 22 10 20 3 10 22 3 3 11 14 19 3
16 14 24 7 11 55 7 22 9 28 3 21 3
26 20 22 25 6 7 12 6 13 7 7 20 11 11From the table, construct a frequency histogram and state for how many hours there were sales of 15 or more ice-creams.
CHECKLIST
Ch 9I: 1, 3, 4, 5, 6, 8, 11
![Picture](/uploads/3/0/5/6/30566275/whatsyourfavoritecolor_orig.jpg)
Remember that the type of data that you want to represent will impact the type of graph you choose to use.
EXAMPLES
Discrete data - Data collected that you count as whole numbers - best represented using bar, column or histogram charts.
Continuous data - Data collected that you measure (ie. Temperature or height graphs) - best represented using line graphs
Percentages - best represented as a pie graph
Comparing two variables - (ie. marks in a Maths test and marks in a Science test) best represented in a Scatterplot
Ordering data - best represented using Stem & Leaf Plots or Frequency Tables
The other thing you need to remember is that all graphs need ‘SALT’. Make sure you remember the following information:
S = Scale
A = Axes
L = Labels
T = Title
EXAMPLES
Discrete data - Data collected that you count as whole numbers - best represented using bar, column or histogram charts.
Continuous data - Data collected that you measure (ie. Temperature or height graphs) - best represented using line graphs
Percentages - best represented as a pie graph
Comparing two variables - (ie. marks in a Maths test and marks in a Science test) best represented in a Scatterplot
Ordering data - best represented using Stem & Leaf Plots or Frequency Tables
The other thing you need to remember is that all graphs need ‘SALT’. Make sure you remember the following information:
S = Scale
A = Axes
L = Labels
T = Title
ACTIVITY
Complete worksheet courtesy of Cambridge GO
Complete worksheet courtesy of Cambridge GO
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