**with an understandable explanation why it is an outlier**. If anyone could post a picture of a stem and leaf plot here with an outlier, explaining why it is an outlier, that would be much appreciated. Thanks in advance.

- Thread starter alexis2
- Start date

outlier is a value which looks isolated from other values, and it can be either upper or lower end.

A good stem and leaf plot

* shows the first digits of the number (thousands, hundreds or tens) as the stem and shows the last digit (ones) as the leaf.

* usually uses whole numbers. Anything that has a decimal point is rounded to the nearest whole number. For example, test results, speeds, heights, weights, etc.

* looks like a bar graph when it is turned on its side.

* shows how the data are spread—that is, highest number, lowest number, most common number and outliers (a number that lies outside the main group of numbers).

outlier is a value which looks isolated from other values, and it can be either upper or lower end.

A good stem and leaf plot

* shows the first digits of the number (thousands, hundreds or tens) as the stem and shows the last digit (ones) as the leaf.

* usually uses whole numbers. Anything that has a decimal point is rounded to the nearest whole number. For example, test results, speeds, heights, weights, etc.

* looks like a bar graph when it is turned on its side.

* shows how the data are spread—that is, highest number, lowest number, most common number and outliers (a number that lies outside the main group of numbers).

I understand what an outlier is; I am just having difficulty understanding what it looks like in a stem and leaf plot. Thanks for the example you provided a link to. I would appreciate it if you could clarify a few things I am not sure about. The example states that "In the above data set, 4 is far apart from the other data items... So, 4 is the outlier of the data set"

How is 4 "apart from the other data items"? Is it because there is a 0 in the stem column?

When there is a 0 in the stem column, does this mean that there is an outlier?

Is a 0 the only way that an outlier shows up in a stem and leaf plot?

Thanks.

Stem Leaf

0 4

2 144457

3 344455

4 2344555

Last edited:

Stem Leaf

0 4

1

2 144457

3 344455

4 2344555

Which makes the value of 4 stand out more wouldn't you agree?

Stem Leaf

0 4

1

2 144457

3 344455

4 2344555

Which makes the value of 4 stand out more wouldn't you agree?

It does stand out more as there is no value for leaf when the stem is 1.

So what actually indicates that there is an outlier in this stem and leaf plot? - the gap in row 1 or the row with a 0 in it? Or both? Is the outlier still 4?

6 : 2

6 : 899

7 : 0011123

7 : 5

9 : 4

9 : 566789

10 : 00000