LE: Review Units 1-3

A custodian notices some dirty tables and wants to know which cleaner is the best to use. He tests three different cleaners and looks at how well they clean compared to tap water. What is the independent variable?

• type of cleaner

• tap water

An experiment is being done to determine how light affects the growth of small zinnia plants. One plant is placed in full sunlight, the second in a shaded area, the third in an unlit closet. What is the independent variable in the experiment?

• the amount of light

• plant in the closet

A custodian notices some dirty tables and wants to know which cleaner is the best to use. He tests three different cleaners and looks at how well they clean compared to tap water. What is the control group?

• type of cleaner

• tap water

Maddie wanted to see if different types of fertilizer influence sunflower growth. What is the control group?

• type of fertilizer

• sunflower grown without fertilizer

• groups with different types of fertilizer

• amount of sun light

Nick wanted to see how high an ice cube would float in different temperatures of water. Identify the dependent variable.

• amount of water
• temperature of water
• height of ice cube
• temperature the ice cube was at its' highest height

Which of these would be the proper way to write a hypothesis

• I think the water will make the plant grow.

• Does Watering plants will make them grow taller?

• If I add more water, then the plant will grow taller because they need water to function.

• Maybe water will make a plant grow taller.

How many variables should you change in an experiment?

• none
• only 1

• 2 or more
• depends on the type of experiment

How many total people took part in the survey?

• 50

• 150

• 100

• 200

What was the temperature of the liquid in the Styrofoam container at 4:00?

• 55 degrees

• 68 degrees

• 73 degrees

• 63 degrees

Identify the dependent variable by looking at the graph.

• Weeks

• Weekly Juice Data

• Cans Sold

• Indirect Relationship