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) 2) 3) 4)5)

Title

Key

Each data value is represented by one "stem" and "leaf"

There is only ONE "leaf" per data value

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 plot1) Find the smallest value2) Find the largest value3) Put in the stems4) Put in the leaves5) 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 89100 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 stem-and-leaf plot:Stratford: 24 18 19 25 32 30 29 23 2115 28 34 18 25 28 22 21 23

The Creek: 23 18 19 26 30 30 32 17 25 32 32 34

28 29 26 25 21 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 1 3 6 10 9 15 29 32 4 12 16 18 21 23 25 17 14 8 6 40

Hanahan: 1 3 8 10 13 16 1425 29 30 31 6 9 121 4 5 8 9 12 23