Understanding diagrams and analyzing data is a critical part of the ISEE exam. You will have to understand how tables and graphs convey information and be able answer questions about them.

The type of chart, table, or graph may change, but your method should be the same:

- Read the title and labels to understand what each component represents
- Look to see if an explanatory key offers more information about the data.
- Study the graph to see what the visualization is meant to show.

This lesson will cover a few common types of data visualization that you may come across on the exam.

Tables are the most common kind of diagram you will find, and can be used to convey data in multiple ways. A table may compare the amount or intensity of multiple variables, or it may compare how those variables change over time. You will see this in the following examples.

In this problem, you are tasked with analyzing the table to assess the popularity of each ice cream flavor. You can see from the column headings that the table shows each of the flavors, and the number of students who voted for that flavor. Given that the top three flavors will be served at the party, you should look for the three flavors with the highest number of votes. You can see from the table that these are cookies and cream, chocolate, and vanilla; therefore, the correct answer is D.

To solve this problem, you must figure out what piece of data you need, and then find how it is represented in the table. What Shelly wants to know is whether Houston is 21 degrees hotter than Chicago in the month of April. Looking at the row representing April, we see that Houston’s average temperature is 62 degrees, while Chicago is 39 degrees. Since 62-39 is 23, this surpasses Shelly’s requirement—she will move to Houston in April and not Chicago because Chicago is too cold.

Bar graphs are another common kind of graph. They help you visualize data by comparing the height of each bar in the diagram.

In the bar graph above, you can see four bars representing the number of miles each person ran in a week. These bars show: Sam ran 22 miles, Kathy ran 30 miles, Kelly ran 15 miles, and George ran 12 miles. Now, you can figure out which statement is true.

- B is false, since Kathy did not run fewer miles than Sam (she ran 30 and he ran 22).
- C is also false, because Kelly and George combined to run 27 miles while Sam ran 22 miles.
- You can now assess that D is false, the average is not over 25; the total number of miles is 79, and 79 divided by 4 is less than 25.
- A is true, because the range, 18, is more than the number of miles Kelly ran, 15.

Pie charts are another way of visualizing data. Just like a real pie, you can think of each portion as a slice of pie. The bigger the slice, the bigger the percentage.

Based on the diagram, you can see that approximately half of all students chose Math as their favorite subject. Then, looking at the remaining half, English looks to be about two thirds of that half. Therefore, History was chosen by a third of students within the second half of the pie chart. One third of one half is equal to one sixth. Therefore, the answer is B!

**Answers to Practice Problems**

- B
- Question 2
- Movie
- 29

- A

Create a free account below to start practicing nearly 7,000 adaptive questions.