STEM and Leaf Plots
What is the main purpose of a STEM and leaf plot?
To organize and display numerical data in a visually meaningful way.
In the STEM and leaf plot, if "2|4" is written, what does it represent?
24
How are multiple-bar graphs different from single bar graphs?
Multiple bar graphs compare two or more sets of data using side-by-side bars.
If a bar graph shows the number of books read by students, and one bar is taller than another, what does that mean?
The taller bar represents more books read.
In a STEM and leaf plot, what is the stem, and what is the leaf?
The stem is the leftmost digit(s), and the leaf is the rightmost digit.
Create a STEM and leaf plot for the following data: 15, 22, 25, 31, 32, 33.
1 | 5
2 | 2 5
3 | 1 2 3
In a STEM and leaf plot, if the stem is 4, and the leaf is 7, what number does it represent?
47
Name two things you could compare using a multiple-bar graph.
Two different sets of data or categories.
If the bar for apples is twice as tall as the bar for oranges, what conclusion can you draw?
There are twice as many apples as oranges.
Explain the difference between qualitative and quantitative data.
Qualitative data is descriptive, while quantitative data is numerical.
How can a STEM and leaf plot help us understand the ages of students in two different classes?
It can show us the ages of each student and help us compare them between classes.
In a STEM and leaf plot, if the stem is 5, and the leaves are 2, 4, and 6, what three numbers are represented?
52, 54, 56
In the multiple bar graph showing the favourite pets of students, how can you tell which pet is the least popular overall?
Compare the heights of the bars for each pet. The one with the shortest bar is the least popular overall.
If you were to create a set of bar graphs to represent the number of pets owned by students in our class, what would you title the graphs?
The graphs could be titled "Our Class Pets" or "Pets We Have".
How might a STEM and leaf plot be useful in comparing the ages of students in two different classes?
A STEM and leaf plot can help compare the distribution of ages in each class and identify any patterns or differences.
Explain a situation where using a STEM and leaf plot would be more helpful than a regular bar graph.
A STEM and leaf plot is helpful when you want to see individual data points and their distribution, which might be lost in a bar graph.
If the STEM and leaf plot has a stem of 3 and leaves of 1, 2, 3, and 4, what four numbers are shown?
The numbers are 31, 32, 33, and 34.
Compare and contrast the information you can get from a single bar graph and a multiple bar graph.
A single bar graph shows data for one category, while a multiple bar graph compares data for two or more categories.
If a set of bar graphs displays the number of students who prefer pizza and burgers, which food is preferred by more students?
The food with the tallest combined bars is preferred by more students.
Describe a situation where you might use either a multiple bar graph or a stem-and-leaf-plot.
Correct answer: E.g., I would use a stem-and-leaf plot to show the number of minutes of running every day for a bunch of students who like to run. Since it is a stem-and-leaf plot, it could also be a bar graph.
What happens if there's a big gap in the STEM and leaf plot stems?
A big gap means there's a big difference between some ages, which could be important to notice.
In a STEM and leaf plot, if the stem is 7, and the leaves are 4, 6, and 8, what three numbers are represented?
The numbers are 74, 76, and 78.
Think about a graph showing how much students like different clubs each month. How can you tell which club becomes more liked every month? Why is this important for planning future club activities?
Just look at which bar gets taller each month - that's the club becoming more popular. This is essential for planning because it shows what students enjoy, and we can plan more activities for the club that everyone likes the most.
If a set of bar graphs shows the number of hours spent on different activities in a week, how many more hours were spent on reading than playing video games?
Compare the heights of the bars for reading and playing video games to find the difference in hours.
If we know how long students spend on homework each day, how could we show this using a STEM and leaf plot and a bar graph? What's good about each one?
A STEM and leaf plot shows each student's exact time, while a bar graph gives us an average. The STEM and leaf plot helps us see each student, and the bar graph helps us compare days easily.