College Bio: Experimental Design

An educated guess that has not yet been tested. 

• law

• theory

• hypothesis

• fact

How many variables should you change in an experiment?

• none
• 1
• 2 or more
• depends on the type of experiment

Tags

NGSS.3-5-ETS1-3

The variable in an experiment that is deliberately changed by the scientist; the variable being tested.

• dependent variable

• independent variable

• data

• control group

If you were testing how well different dish soaps clean grease, the independent variable would be the:

• dish type

• amount of grease

• dish soap type

• grease type

Dory set up an experiment to see how the mass of a ball affects the distance it rolls off a ramp. What is the dependent variable?

• distance traveled by the ball
• height of the ramp
• mass of the ball
• ball type

Tags

NGSS.MS-PS2-2

What is the control group?

• amount of time the spray stays on the shower
• the half of the shower sprayed with water
• the half of the shower sprayed with coconut juice
• the amount of slime

Tags

NGSS.MS-LS1-5

Ava wants to test if lemon juice will slow down apple browning. She cuts two slices of an apple and covers both slices with lemon juice. She leaves the slices on the counter for 24 hours and then measures the amount of browning on each slice. What was the error in her experimental design?

During an experiment, a scientist tests variables. The (a)   variable can be changed by the scientist, who then uses the (b)   variable to assess whether there were any changes. During the experiment, they use a(n) (c)   group to give their independent variable to and a(n) (d)   group that they do not give their independent variable to.

• Independent Variable

• Dependent Variable

• Control

• Experimental

Students wanted to know how plant growth would be affected when given different amounts of water. To setup the experiment, pea plants were potted in the same pots and given the same amount of sunlight. 2 plants received 1/2 a cup of water, 2 plants received 1 cup of water, and the last 2 plants received 2 cups of water daily.

• Independent Variable

• Amount of water

• Dependent Variable

• Plant growth

• Constants

• the same pots and the amount of sunlight

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

Which of the following is a characteristic of a good hypothesis?

• It is vague and general.

• It is testable.

• It is based on personal beliefs.

• It cannot be proven wrong.