Data and Averages

True or False: Scientists use the smallest sample size possible in experiments because smaller sample sizes are more reliable.

• True

• False

Match the following

• 
  independent variable

• what is changed in an experiment

• sample size

• 
  

  how many times you test the variable you are studying in an experiment

• dependent variable

• what is measured in an experiment

Tags

NGSS.MS-PS2-2

Using the diagram. The independent variable column is number

• one

• two

Using the diagram. The outlier is what number?

• one

• two

• three

Examine the data table. What is the independent variable?

• number of fish caught

• type of bait

• hours

Examine the data table. What is the dependent variable?

• number of fish caught

• type of bait

• hours

Examine the data table. What is the control group?

• number of fish caught

• worm

• no bait

Examine the data table. What is the experimental group?

• number of fish caught

• no bait

• minnow

Tags

NGSS.MS-LS2-1

What is the average of this set of bowling scores? (102, 191, 79)

• 124

• 80

• 102

A scientist wants to study the effectiveness of a new pesticide on cockroaches.

The scientist divides the cockroaches into 2 groups. He gives each group the same amount of food and water and places them in the same type of tank.

• The cockroaches in Group A are NOT sprayed with pesticides.

• The cockroaches in Group B are sprayed with pesticides.

After 2 hours, the scientist counts how many cockroaches are still living in each group.

What is the dependent variable?

• 
  the number of cockroaches that are still alive after 2 hours

• the type of tank

• the pesticide

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4