Item 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.

A student thinks that there are three variables (X, Y and Z) that may affect the result of her experiment.

She decides to change only variable X, and let variables Y and Z stay the same.

What is the student trying to find out?

  1. If variable X affects the result of her experiment.
  2. If variables X and Y affect the result of her experiment.
  3. If variables Y and Z affect the result of her experiment.
  4. If variables X, Y, and Z affect the result of her experiment.

Distribution of Responses

Chart showing distrubtion of responses for Item CV030001

Percent of students responding correctly

Overall67%
Grades 6–857%
Grades 9–1279%
Male64%
Female71%
Primary Language is English69%
Primary Language is not English56%

View data table