Notice & Wonder

A screenshot of a saved Transformer called filter-is-heavy

1 What do you Notice about the Filter Transformer on the left, which you can also view in the Boolean Starter File?

2 What do you Wonder about the Filter Transformer?

3 In the Boolean Starter File, open filter-is-heavy. (To do so, select the - that appears on the left when you hover.) Select "Apply Transformer". In your own words, describe what happened when you applied the Filter transformer to the Animals Dataset.

Some Booleans You Might Know

In the filter-is-heavy Transformer (above), we used a Boolean expression to tell CODAP that we wanted to keep all rows where Pounds was greater than 32. The greater than symbol (>) is an example of a Boolean operator that you’re probably already familiar with.

4 Here are six different Booleans that we will use in CODAP.

  • Put a check mark by the Booleans where you can guess what they do.

  • Put a question mark by any Booleans that you’re not sure about.

>

<

=

> =

> =

! =

Boolean-producing expressions are yes-or-no questions and will always evaluate to either true (“yes”) or false (“no”). What will each of the expressions below evaluate to? Write down your prediction in the space provided. You’ll get a chance to see if you were correct on the next page.

5 3 <= 4

6 "a" > "b"

7 3 = 2

8 "a" < "b"

9 2 < 4

10 "a" = "b"

11 5 >= 5

12 "a" != "a"

13 4 >= 6

14 "a" >= "a"

15 3 != 3

16 "a" != "b"

These materials were developed partly through support of the National Science Foundation, (awards 1042210, 1535276, 1648684, 1738598, 2031479, and 1501927). CCbadge Bootstrap by the Bootstrap Community is licensed under a Creative Commons 4.0 Unported License. This license does not grant permission to run training or professional development. Offering training or professional development with materials substantially derived from Bootstrap must be approved in writing by a Bootstrap Director. Permissions beyond the scope of this license, such as to run training, may be available by contacting contact@BootstrapWorld.org.