# Experimental Design: Independent and Dependent Variables

## Quiz by Jennifer Livers

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11 questions
• Q1
Students of different ages were given the same jigsaw puzzle to put together. They were timed to see how long it took to finish the puzzle. What is the independent variable?
Ages of the students
Type of jigsaw puzzle
Time to finish the puzzle
30s
• Q2
Students of different ages were given the same jigsaw puzzle to put together. They were timed to see how long it took to finish the puzzle. What is the dependent variable?
Ages of students
Type of jigsaw puzzle
Time it took to put the puzzle together
30s
• Q3
Students of different ages were given the same jigsaw puzzle to put together. They were timed to see how long it took to finish the puzzle. What is the controlled variable?
Participants were given same type of puzzle.
Age of students
Time to finish the puzzle
30s
• Q4
An investigation was done with an electromagnetic system made from a battery and wire wrapped around a nail. Different sizes of nails were used. The number of paper clips the electromagnet could pick up was measured. What is the independent variable?
Battery and wire
Sizes of nails
# of paper clips
30s
• Q5
An investigation was done with an electromagnetic system made from a battery and wire wrapped around a nail. Different sizes of nails were used. The number of paper clips the electromagnet could pick up was measured. What is the dependent variable?
Different sizes of nails
Number of paper clips picked up
Electromagnetic system
30s
• Q6
The more time people spend using social media, the less they read books. What is the independent variable?
People
Time on social media
30s
• Q7
A comprehension test was given to students after they had studied textbook material either in silence or with the television turned on. What is the dependent variable?
Amount of time studying
Silence
45s
• Q8
You want to compare brands of paper towels, to see which holds the most liquid. What is the independent variable?
Brand of paper towel
How much liquid the paper towel absorbs
Person comparing paper towels
45s
• Q9
You want to compare brands of paper towels, to see which holds the most liquid. What is the dependent variable?
Brand of paper towel
Amount of liquid absorbed by the paper towel
45s
• Q10
You want to determine whether a chemical is essential for rat nutrition, so you design an experiment. What is the independent variable?
Health of the rat
The presence or absence of the chemical
Type of food the rat eats
45s
• Q11
You want to determine whether a chemical is essential for rat nutrition, so you design an experiment. What is the dependent variable?
The absence or presence of the chemical.
The food the rat eats.
The health of the rat.
45s

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