Looking for Associations

Let’s look for
associations in
data!

Notice and Wonder:
Bar Association

Activate: Warm Up Activity 9.1

What do you notice? What do you wonder?

Matching Representations

Comprehend/Apply: Activity 9.2

● MLR8: Discussion Supports
● MLR2: Collect and Display

Why do you think this is called a “two-way table”?

What does the 25 mean? What does the 55 mean?

How many people are represented in this table?

Why do you think this is called a “bar graph?”

What do the blue bars represent? How do you know?

Where does the 25 from the table show up in this
bar graph?

Why do you think this is called a “segmented bar graph”?

What do you think the vertical axis represents?

Let's practice identifying data in a frequency table.

Building Another Type

of Two-Way Table

Comprehend/Apply: Activity 9.3

● Think Pair Share

● MLR2: Collect and Display

Based on this data, who is more likely to watch the news
daily: someone who is younger than 18 or someone who
is 18 or older?

Based on the numbers in the table, there are more
younger people who watch news (30) than older (10).
On the other hand, the survey reached out to 110 young
people and only 15 older people. Without looking at the
whole table, that information may have been missed.

In cases like this, finding a relative frequency including
percentages can be more helpful than looking at the
actual frequency. Let’s try it!

●

What does 42% in the table mean?

●

What is the total of percentages in the first column? What’s
wrong with that answer?

Organize: Activity Synthesis

● Did you say there was or was not an association

between age and cell-phone use? Explain.

● What did the relative frequency table show you that

was harder to see in the original two-way table?

Let's continue practicing identifying data in a frequency table. This time, we will include percentages.

Today’s Goals

❏ I can identify the same data represented in a bar graph, a

segmented bar graph, and a two-way table.

❏ I can use a two-way frequency table or relative frequency

table to find associations among variables.