Scientific Method Review Final

Mr. S. sets up an experiment to see how the mass of a ball affects the distance it rolls off a ramp.  Identify the independent variable.

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

You want to find out if different types of fertilizer affect plant growth. Fertilizer type (brand) represents the ________ variable

• Dependent

• Independent

• Control group

• Controlled

An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid; water, apple juice, or milk. In this investigation, what should be the dependent variable?

• Type of plant
• Water, apple juice, milk
• Plant growth
• The number of new leaves on the plant

A student wants to test the effects different types diets on heart rate.  What is the independent variable?

• heart rate
• type of diet

• high protein vs high carbohydrate food

• The amount of calories consumed per day

A student wants to know which type of gum blows the biggest bubbles. Which of these would be a good controlled variable (constant)?

• type or brand of gum

• diameter of bubble

• mass of gum chewed

• volume of bubble

An experiment for a new asthma medication was set up into two groups. Group one was given the new drug for asthma, while group 2 was given a sugar pill. The sugar pill serves as a

• control group

• dependent variable

• placebo

• controlled variable

You want to see what happens to teeth in different liquids. You put one tooth in cola, one in juice, one in vinegar and one in plain water. What is the control group?

• cola

• juice

• vinegar

• water

Which of the following is NOT a characteristics of a hypothesis?

• Must be made with background knowledge

• Must be testable

• Must make a prediction

• Must always be correct

• Must include the IV and DV

The easy way to pick out an experiments responding (DV) variable is to look for:

• What was purposefully changed
• Number of trials
• What's being measured
• The test group

Is a hypothesis ever proven 'true'?

• No!

• Yes!