KEY WORDS
The tens digit in a stem-and-leaf plot is called the…
Stem
Put these in order: 16, 12, 19, 14
12, 14, 16, 19
What is wrong?
Stem | Leaf
1 | 2 8 5
Leaves are not in order.
Find the range of 8, 12, 16
8
Which team is more consistent: one with range 6 or range 20?
Range 6
The ones digit in a stem-and-leaf plot is called the…
Leaf
Build the stem-and-leaf for: 12, 15, 18
1 | 2 5 8
What is missing?
Dataset: 12, 15, 18, 21
Stem | Leaf
1 | 2 5
2 | 1
18 is missing.
Find the median of 2, 4, 6, 8, 10
6
What does a large range tell us?
The data is spread out.
Name the measure that is the difference between the highest and lowest value.
Range
How many values are in this plot?
Stem | Leaf
1 | 2 4 6
2 | 1 3
5
Why must leaves be in order?
So the data is organised and easy to read / find median.
Find the mean of 10, 20, 30
20
If the median stays the same but the mean increases, what might have happened?
An outlier was added.
Another word for average.
Mean
What is the largest value in this plot?
Stem | Leaf
1 | 2 5 7
2 | 0 4
24
What mistake was made?
Range of 10, 12, 15 was given as 3.
Range is highest minus lowest (15 − 10 = 5).
Find the median from:
Stem | Leaf
1 | 3 5 7
2 | 0 2
17
Why might we use the median instead of the mean?
Because it is less affected by extreme values.
What is a sample?
Collecting data from part of a group.
Find the median from:
Stem | Leaf
1 | 2 4 6 8
2 | 1
16
If a value is missing from the plot, how does that affect the median?
It can change the median because the number of values changes.
Which measure changes most when an extreme value is added? (outlier)
Mean
Create a dataset with a median of 10 and range of 8.
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