Stem and Leaf Line Plot
Dot plots:
- Number line with dots on it
- Dots represent data given
- Must have a dot for each piece of data
outlier: A value that lies outside
the rest of the data
What every dot plot needs:
- Title
- Numbers labeled on numbe rline
- Dot for every data value given
1) The average, in millions, of trash in a
certain area over the course of a year
and a half
1.4 1.5
2.0 3.1
2.1
1.0
1.5 1.8
1.2
1.3
2.5 3.0
3.1 2.1
2.6 2.7 2.5 3.5
Stem and Leaf Line Plot
Stem-and-leaf plot musts:
1) Title
2)Key
3)Each data value is represented by one "stem" and "leaf"
4)There is only ONE "leaf" per data value
5)NO decimals inside a S&L plot. The key tells us where the decimals are
*** "Leafs" go in increasing order ***
Stem and Leaf Line Plot
Steps to create your stem and leaf
plot
1) Find the smallest value
2) Find the largest value
3) Put in the stems
4) Put in the leaves
5) Include a key and title
Stem and Leaf Line Plot
Draw a stem-and-leaf plot:
1) The grade of the first test in a statistic course:
100 89 93 67 82 87 73 70
83 92 65 75 85 85 88 89
100 103 68 79 88 89 91 97
3) The average, in millions, of trash in a
certain area over the course of a year
and a half
1.4 1.5
2.0 3.1
2.1
1.0
1.5 1.8
1.2
1.3
2.5 3.0
3.1 2.1
2.6 2.7 2.5 3.5
Stem and Leaf Line Plot
Back-to-back stem-and-leaf plot:
Exact same as a regular stem-and-leaf
plot except for the data on the left the
leaves are "backwards"
*Just remember that the smallest
number for the leaves is always the
closest to the stem*
The ACT scores of 2 different schools
are given, make a back-to-back stemand-leaf plot:
Stratford:
24 18 19 25 32 30 29 23 21
15 28 34 18 25 28 22 21 23
The Creek:
23
32
28
18
17
29
19
25
26
26
32
25
30
32
21
30
34
29
Stem and Leaf Line Plot
Draw a back-to-back stem-and-leaf plot comparing the
number of years teachers have been teaching from two
different high schools:
Timberland: 1
29
23
Hanahan: 1
25
1
3
29
4
1
32
25
8
30
5
3
4
17
6
12
14
10
31
8
10
16
8
13
6
9
9
18
6
16
9
12
15
21
40
14
12
23