1. Graphs
Grade 8
Mr. Arthur

2. Stem and Leaf Plot Arranges data quickly
Prepares data to put into a histogram possibly

3. Stem and Leaf Plot

4. Stem and Leaf Plot

5. A bakery collected the following data about the
# of loaves of bread sold each of the 24 business days:
53, 49, 27, 48, 60, 52, 44, 38, 47, 52, 82,46, 55,
31, 39, 54, 51, 47, 50, 45, 50, 61, 43, and 64.
Make a stem-and-leaf plot of the data.
Find the median and mode(s) of the data.
How can the owner use the stem-and-leaf plot
to make plans for baking bread?
Stem
Leaf

6. Bar Graph

7. Double Bar Graph (Grade 4)

8. Multi-Bar Graph (Grade 5)

9. Histogram

10. Histogram

12. Bar Graphs vs. Histograms

14. *Ex 2. The given data shows the # of people in 24 vehicles
hat passed a designated checkpoint.
1, 4, 1, 2, 2, 1, 3, 1, 3, 2, 2, 6,
4, 2, 1, 1, 2, 4, 3, 1, 2, 4, 2, 3.
Make a frequency table for these data.
Make a histogram from the frequency table. #
Frequency 1 2 3 4 5 6

15. Line Graph Line graph Advantages Disadvantages
A line graph plots continuous data as points and then joins them with a line. Multiple data sets can be graphed together, but a key must be used.
Shows change over time (e.g. temperature change, income change, Kalyani’s change in speed while running a given distance)
Advantages
Can compare multiple continuous data sets easily
Interim data can be inferred from graph line.
Disadvantages
Use only with continuous data

17. Single Line Graph

18. Double Line Graph (Grade 5)

19. Circle Graphs

20. Pie Chart – Circle Graph Example

22. Scatter Plot Scatter plot Advantages Disadvantages
A scatter plot displays the relationship between two factors of the experiment. A trend line is used to determine positive, negative or no correlation.
Advantages
Shows a trend in the data relationship
Retains exact data values and sample size.
Shows minimum/maximum and outliers
Disadvantages
Hard to visualize results in large data sets
Flat trend line gives inconclusive results.
Data on both axes should be continuous.

23. Scatter Plot Example

24. Outliers

25. No Correlation If there is absolutely no correlation present, the value given is 0.

26. Perfect linear correlation: A perfect positive correlation is given the value of 1. A perfect negative correlation is given the value of -1.

27. Strong linear correlation: The closer the number is to 1 or -1, the stronger the correlation, or the stronger the relationship between the variables.

28. Weak linear correlation: The closer the number is to 0, the weaker the correlation.

29. What is the correlation?
What could this be a chart of?

30. Correlation AND Causation??