1. Data Distribution – Stem & Leaf Plot

2. Data Distribution – Stem & Leaf Plot
The purpose of a stem and leaf plot is to indicate how a data set is distributed.
data distribution – data distribution refers to how the data values in a set are spread (i.e. range between high and low values, clusters, where there might be no data, spread evenly or randomly etc.)
stem and leaf plot – an organization/display of data to show the distribution of the data based on place value

3. Data Distribution – Stem & Leaf Plot
Create a stem and leaf for the following data which represents the # of people to have x-rays over a 16 day period

4. Data Distribution – Stem & Leaf Plot
Step 1 – although not completely necessary it may help to arrange the data in order

5. Data Distribution – Stem & Leaf Plot
Step 2 – Establish 2 columns, one for the stems and one for the leaves. Enter each # in the set by recording the last digit as the leaf and the remaining/leading digit(s) as the stem. (Once a stem has been established it can be used for all the numbers that require that stem. For example once a # such as 25 has been entered and the stem of 2 established it could be used for other #’s in the twenties that require a stem of 2 and only the leaves would be entered.)

6. Stem (leading digit(s)) Leaf (last digit) 6
Each data value is read by combining the stem and a leaf. For example in the second row there are 2 values – 13 and 14
The shape of the plot indicates the distribution of the data so neatness (i.e. spacing) is important.
Conclusions – Comment on the distribution of the data.

7. They commonly x-ray 30-40 patients per day
It is not common to x-ray less than 10 patients per day or more than 50
They have never x-rayed patients in a day