Types of Data
Mean
Median, Mode & Range
Displays & Misleading Graphs
Venn Diagrams
100
Is "favourite sport" categorical or numerical data?
Categorical
100
Find the mean of 2, 4, 6
4
100
Find the mode of 3, 5, 5, 7, 9
5
100
Which type of graph shows dots stacked above a number line?
A dot plot
100
Venn diagram of 30 students:
Soccer only = 12, Both = 5, Netball only = 8

How many students are outside both circles (play neither sport)?
5
200
Is "number of pets" discrete or continuous data?
Discrete (numerical)
200
Find the mean of 5, 7, 8, 10, 10
8
200
Find the range of 12, 4, 19, 8
15
200
A dot plot shows: 2 dots at 1, 4 dots at 2, 1 dot at 3 and 3 dots at 5.

How many data values are there?
10
200
Venn diagram of 30 students:
Soccer only = 12, Both = 5, Netball only = 8

How many students play soccer altogether?
17
300
Is "a student's height" discrete or continuous data?
Continuous (numerical)
300
Find the mean of 3, 9, 12, 4, 7, 1
6
300
Find the median of 6, 2, 9, 4, 7
6
300
A dot plot shows: 2 dots at 1, 4 dots at 2, 1 dot at 3 and 3 dots at 5.

What is the mode?
2
300
Venn diagram of 30 students:
Soccer only = 12, Both = 5, Netball only = 8

What is the relative frequency of students who play both sports?
5
30
=
1
6
400
Surveying every student in the school is called a ___. Surveying only 30 students is called a ___.
Census; sample
400
Four test scores have a mean of 15. Three of them are 12, 18 and 14. Find the fourth score.
16
400
Find the median of 10, 3, 8, 5, 12, 6
7
400
A very large outlier is added to a data set. Which changes more: the mean or the median?
The mean
400
30 students were surveyed: 18 like pizza, 14 like pasta and 6 like both.

How many students like pizza only?
12
500
Why is surveying only the basketball team a poor way to find the favourite sport of all Year 7s?
It is a biased sample: it does not represent all Year 7s
500
Five numbers have a mean of 8. A sixth number is added and the mean becomes 9. What number was added?
14
500
Five whole numbers have a mode of 4, a median of 6, a range of 8 and a smallest value of 4. Give a possible set of numbers.
For example 4, 4, 6, 9, 12 (the 4th number can be 7, 8, 9, 10 or 11)
500
A bar graph's vertical axis starts at 90 instead of 0. Why is this misleading?
It makes small differences between the bars look much bigger than they are
500
30 students were surveyed: 18 like pizza, 14 like pasta and 6 like both.

What is the relative frequency of students who like neither?
4
30
=
2
15
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