**Answers for Variables Worksheet**

For each experiment below specify the independent, dependent, and controlled variables.

- Two groups of students were tested to compare their speed working math problems. Each group was given the same problems. One group used calculators and the other group computed without calculators.

- Independent
Variable was _
______________________________________________*The presence of Calculators or no Calculators* - Dependent
Variable was
______________________________*The speed of the students as they worked the problems* - Controlled
Variable was _
______________________*Same problems, same calculators, same type of students,*

- Students of
different ages were given the same puzzle to assemble. The puzzle assembly
time was measured.
- Independent
Variable was __
__*the various ages of the students* - Dependent
Variable was ____
_________*the time it took to complete the puzzle* - Controlled
Variable was ___
____________________*Same puzzle , probably the same test room, lighting, temperature, etc.*

- Independent
Variable was __

- A study was done
to find if different tire treads affected the breaking distance of a car.
- Independent
Variable was ______
______*different tire treads* - Dependent
Variable was _______
___________*breaking distance* - Controlled
Variable was _______
_________________*same car, same speed of car when breaks were applied*

- Independent
Variable was ______

- A study was done
with an electromagnet system made from a battery and wire wrapped around a
nail. Different sizes of nails were used and the number of paper clips that
the electromagnet could pick up was measured.
- Independent
Variable was _____
____________*sizes of the nails* - Dependent
Variable was _____
_______________*how many paper clips could be picked up* - Controlled
Variable ญญญญญญญญญญญญญญญญญญญ____
__________________*Same type of wire* - Controlled
Variable ______
__*same number of coils of the wire* - Controlled
Variable ญ_____
___________*same type of paper clips, same type of battery, etc.*

- Independent
Variable was _____