Misconception CVM013:

When testing the effect of a variable on the outcome of the experiment, it does not matter if other relevant variables change at the same time (AAAS Project 2061, n.d.)

Items that test for misconception CVM013
Item ID
Number

Item Description

How Often the Misconception was Chosen

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CV013003

To find out if the type of swimsuit swimmers wear affects a swim team's performance, it is important that everyone wear the same kind of swim cap because otherwise it wouldn't be possible to find out the effect of the swimsuits on the team's performance.

12%

CV005004

To find out the effect of paper type on how well paper airplanes fly, it is important that all the airplanes tested use the same design because if they didn't, it wouldn't be possible to tell what effect the type of paper had on how well the paper airplanes fly.

9%

CV016003

To determine the effect of water temperature on getting stains out of shirts, it is important for all shirts to be washed for the same length of time because if they weren't, it wouldn't be possible to find out the effect of temperature.

7%

CV015006

To determine the effect of speed on a truck's gas mileage, is important that trucks of the same weight be compared because if the trucks didn't have the same weight, it wouldn't be possible to learn about the effect of speed on gas mileage.

6%

CV015005

To find out which car gets better gas mileage, it is important that both cars get the same grade of gas because if they didn't, it wouldn't be possible to tell which car gets the better gas mileage.

6%

CV012003

To find out if the shape of objects has an effect on how fast the objects sink, it is important that all the objects tested have the same mass because if they didn't have the same mass, it wouldn't be possible to learn about the effect of shape on how fast they sink.

5%

CV014003

To find out if type of soil affects the growth of carrot plants, it is important that all of the plants get the same amount of water because if they didn't, it wouldn't be possible to tell which soil type was better.

5%

Items that test for misconception CVM013 in other key ideas

CV001003

A carts and ramp experiment in which the weight of the carts is varied and the height of the ramp is held constant could tell you the effect of the weight of the cart on the cart's speed.

33%

CV024005

An experiment in which variable X is allowed to vary and variables Y and Z are held constant could tell you if variable X has an effect on the result of the experiment.

11%

CV002003

An experiment in which the amount of sunlight is varied and the minerals in the plant's water is held constant could tell you the effect of light on plant growth.

5%