1. Stem/Leaf plots and frequency tables/Histograms
Objective: students will create an accurate stem/leaf plot and be able to answer questions based on the information. They will then construct a frequency table and from that make a histogram.

2. Information stem/leaf
Stem/leaf plot: display data by digits.
Stem: 1st digits
Leaf: last digit
Ex: 34
3 is the stem
4 is the leaf
To make:
Create key
Draw graph, i.d. stem and leaf
Put stems in order

3. Stem Leaf plot
23, 25, 45, 21, 54, 60, 68, 49, 52
234, 245, 257, 249, 307, 238, 240, 265

4. Stem/Leaf plot
17, 11, 25, 58, 96, 28, 11, 19, 20 , 31
170, 152, 179, 182, 193, 158, 149, 160

5. Interpret Information from stem/leaf
Stem A
, 2, 5,
4 1, 5, 9
5 0, 4, 5, 8
6 0, 2, 5
Stem B
3 0, 5, 9
4 0, 0, 2, 5, 5
5 4, 5, 8
6 5, 9
Compare Median prices.
Which has more sneakers priced over $50?
Which store has more sneakers priced between $30-$40?

6. Creating Frequency Table
Frequency: number of times event occurs.
Frequency table: groups data into intervals to show frequency.

7. Create Frequency Table
3, 8, 14, 10, 11, 20, 12, 13, 11, 13, 12, 18, 12, 14

8. Create Frequency Table
7, 15, 4, 14, 8, 12, 5, 3, 6, 11

9. Creating Histogram To make: Information
intervals x-axis and frequency y-axis
draw bars to frequency
give histogram title
Information
Histogram: data display from frequency table.
*one bar each interval
*length = frequency
*no gaps between bars.

11. Create histogram
12, 18, 43, 17, 35, 17, 10, 16, 16, 44, 19, 29, 22, 31, 16

12. Create Histogram
9, 15, 2, 4, 9, 11, 10, 1, 18, 4, 9, 2, 8, 7, 4, 11, 10, 9, 16, 5