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→Concept #2 Data and types of data
=== Activities ===
=== Activities ===
# Activity No #1 '''Concept Name - Activity No.'''
# Activity No #1 '''[[Representing data- Activity 1|Representing Data - Activity No1]].'''
# Activity No #2 '''Concept Name - Activity No.'''<br>
# Activity No #2 '''Concept Name - Activity No.'''<br>
|}
|}
=== Meaning of Frequency ===
=== Meaning of Frequency ===
nominal data sets.
nominal data sets.
A> In the past year, you have recorded the
A> In the past year, you have recorded the
Imagine that a tutor asks 100 students to complete
Imagine that a tutor asks 100 students to complete
Dependent Variable: Test Mark (measured from 0 to
Dependent Variable: Test Mark (measured from 0 to
Independent Variables: Revision time (measured in
Independent Variables: Revision time (measured in
The dependent variable is simply that, a variable
The dependent variable is simply that, a variable
Therefore, the aim of the tutor's investigation is
Therefore, the aim of the tutor's investigation is
In the section on experimental and
In the section on experimental and
=== Categorical and Continuous Variables ===
=== Categorical and Continuous Variables ===
'''Nominal variables''' are variables that have
'''Nominal variables''' are variables that have
'''When not to use the mean'''
'''When not to use the mean'''
== Summary of when to use the mean, median and mode ==
== Summary of when to use the mean, median and mode ==
A. 27 members of a
A. 27 members of a
Range = maximum value - minimum value
Range = maximum value - minimum value
For example, let us consider the following data
For example, let us consider the following data
The maximum value is 85 and the minimum value is
The maximum value is 85 and the minimum value is
Order Score Order Score Order Score Order
Order Score Order Score Order Score Order
20th 42 40th 52 60th 64 80th 74 100th 85
20th 42 40th 52 60th 64 80th 74 100th 85
First quartile (Q1) = 45 + 45 ÷ 2 = 45
First quartile (Q1) = 45 + 45 ÷ 2 = 45
In the above example, we have an even number of
In the above example, we have an even number of
Quartiles are a useful measure of spread because
Quartiles are a useful measure of spread because
Interquartile range = Q3 - Q1
Interquartile range = Q3 - Q1
However, it should be noted that in journals and
However, it should be noted that in journals and
A slight variation on this is the
A slight variation on this is the
The absolute and mean absolute deviation show the
The absolute and mean absolute deviation show the
=== Absolute Deviation and Mean Absolute Deviation ===
=== Absolute Deviation and Mean Absolute Deviation ===
To find out the total variability in our data set,
To find out the total variability in our data set,
=== Variance ===
=== Variance ===
As a measure of variability, the variance is
As a measure of variability, the variance is
[[Image:KOER-%20Mathematics%20-%20Statistics_html_1afc44b3.png]]
[[Image:KOER-%20Mathematics%20-%20Statistics_html_1afc44b3.png]]