Types of Graphs
What type of graph uses pictures or symbols to display data?
Pictograph
What is the range of this dataset: 21, 20, 36, 11, 40, 32
29
In the number 47, this digit would be the leaf in a stem-and-leaf plot.
7
This is the first number that should usually appear on a graph’s scale to avoid confusion.
Zero
What is skewed data?
Skewed data is when the numbers are mostly on one side, with a few values far away on the other side.
Name 4 things that are important to include in a graph.
Title, labels, scale, key, data, etc.
What are the steps to calculate the median?
Order the numbers from smallest to biggest and find the middle value. If there are two values in the middle, add them up and divide the sum by 2.
What is the main purpose of a stem and leaf plot?
To organize collected data
If the numbers on a graph jump unevenly (like 0, 10, 100), it can confuse readers; this is a problem with the...
Scale
What are the two ways data can be skewed?
Positive and negative
This part of a graph explains what symbols or colors mean.
Key or legend
What is the mode of this dataset: 3.2, 3.1, 3.4, 3.4, 3.2
3.2 and and 3.4
A stem-and-leaf plot showing “5 | 1 3 7” represents these three data values. (Key: 5 | 2 = 52)
51, 53, 57
If the vertical axis does not start at zero, it can make differences look bigger; this is called...
A broken scale
Skewed data is caused by these unusual numbers that are very high or very low.
Outliers
What is the main difference between a stacked bar graph and a multiple bar graph?
Bars are stacked instead of placed side by side
The mean of 4 numbers is 10. This is their total sum.
40
In a stem-and-leaf plot, this part usually represents all but the last digit of a number.
The stem
When only a portion of overall data is selected to be shown on a graph, this is called...
Explain why the mean is not always the best measure of central tendency for skewed data.
Because extreme values pull the mean in the direction of the skew, making it unrepresentative of the “typical” value.