Experimental Design Practice!!

Identify the IV:

What is the effect of sugar on sleep?

• sleep (hrs)

• group with no sugar

• type of candy

• sugar (g)

Identify the IV:

How does caffeine affect plant growth?

• caffeine (g)

• plant growth

• plant height (cm)

• water

Identify the DV:

Investigate the effects of phone use on people's stress levels.

• stress levels

• phone use

• number of people

• no phone use

Identify the DV:

How does a car's engine affect carbon dioxide emissions?

• type of engine

• carbon dioxide emissions

• type of car

• time

Identify a constant variable:

What is the effect of acidity on a goldfish's heart rate

• amount of acid

• heart rate

• pH

• type of goldfish

Identify the DV:

How does temperature affect bird populations?

• number of birds

• temperature

• room temperature

• type of birds

Identify the control group:

How does peanut butter affect jelly?

• jelly

• peanut butter

• no peanut butter

• no jelly

Identify the IV:

What is the effect of age on a student's test scores?

• test scores

• type of test

• student

• age

Identify a constant variable:

How does social media affect student happiness?

• social media

• amount of time on social media

• student happiness

• happiness level

Identify the control group:

How does the lack of calcium affect plant growth?

• plant mass (g)

• no calcium

• calcium

• lack of calcium