Misconception CVM011:

A given experiment tests for the effects of ALL related variables, regardless of whether they are allowed to vary or are held constant (AAAS Project 2061, n.d.).

Items that test for misconception CVM011
Item ID
Number

Item Description

How Often the Misconception was Chosen

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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.

28%

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.

26%

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.

24%

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.

23%

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.

21%

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.

20%

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.

18%

Items that test for misconception CVM011 in other key ideas

CV017002

A controlled experiment involving the behavior of fish in fish bowls, in which the number of fish in the bowls varies and the temperature of the water and the amount of light is held constant, allows you find out the effect of the number of fish on fish behavior.

33%

CV023005

In an experiment involving two variables (X and Y) that could affect the outcome of the experiment, changing X and keeping Y constant allows you to find out the effect of X on the outcome of the experiment.

28%

CV019002

A controlled experiment involving the floating of clay boats, in which the shape of the boats varies and the weight of the boats stays the same, can tell you if shape affects the floating of the boats.

24%

CV018002

A controlled experiment involving the drying of swimsuit fabric, in which the type of fabric changes but how large a piece of fabric you use and how wet the fabrics are to start with are held constant, can tell you if the type of fabric affects how long it takes the fabrics to dry.

20%

CV030001

In an experiment involving three variables (X, Y, and Z) that could affect the outcome of the experiment, changing X and keeping Y and Z constant allows you find out the effect of X on the outcome of the experiment.

9%