Experimental Design Test Review

The independent variable is the factor in the experiment that we can change.

• True

• False

Which is an example of quantitative data?

• The temperature of the water is 200 degrees Fahrenheit.

• The sandpaper feels grainy and rough.

• The leaves have turned yellow, red, and purple.

• The cotton candy smells like maple syrup.

A dependent variable is an educated guess.

• True

• False

What is a constant?

• Part of the experiment the scientist changes or controls

• Part of the experiment that does not change

• Part of the experiment that reacts to the independent variable

• Base experiment that the scientist compares with other trials

Two groups of plants (Group 1 and Group 2) were planted in identical pots, with identical soils, in identical lighting and temperature environments, receiving identical amounts of water and fertilizer. Every day, Group 2 plants also received small, measured amounts of acid mixed with the water that they received.

What is the independent variable?

• The temperature

• The acid

• The fertilizer

• The soil

Two groups of plants (Group 1 and Group 2) were planted in identical pots, with identical soils, in identical lighting and temperature environments, receiving identical amounts of water and fertilizer. Every day, Group 2 plants also received small, measured amounts of acid mixed with the water that they received.

What is the control group?

• Group 1

• Group 2

Two groups of plants (Group 1 and Group 2) were planted in identical pots, with identical soils, in identical lighting and temperature environments, receiving identical amounts of water and fertilizer. Every day, Group 2 plants also received small, measured amounts of acid mixed with the water that they received.

What is not a constant?

• The type of water

• The pots

• The soils

• The temperature

There were 5 dead leaves at the bottom of the plant.

Is this an example of qualitative or quantitative data?

• Qualitative Data

• Quantitative Data

SpongeBob noticed that his favorite pants were not as clean as they used to be. His friend, Sandy, told him that he should try using Clean-O detergent, a new brand of laundry soap she found at Sail-Mart. SpongeBob made sure to wash one pair of pants in plain water and another pair in water with the Clean-O detergent. After washing both pairs of pants three times each, the pants washed in the Clean-O detergent appeared to be cleaner than the pants washed in plain water.

What is the independent variable?

• Pair of pants

• Spongebob

• Sandy

• Type of water

SpongeBob noticed that his favorite pants were not as clean as they used to be. His friend, Sandy, told him that he should try using Clean-O detergent, a new brand of laundry soap she found at Sail-Mart. SpongeBob made sure to wash one pair of pants in plain water and another pair in water with the Clean-O detergent. After washing both pairs of pants three times each, the pants washed in the Clean-O detergent appeared to be cleaner than the pants washed in plain water.

What is the dependent variable?

• Spongebob

• Cleanliness of pants

• Type of water

• Sandy