If a researcher studies fourth-grade students to determine the effects of rewarding good behavior on subsequent behavior, which of the following is least likely to be an extraneous variable?

student grade level

student attitude

teacher characteristics

parent's parenting style

student grade level

Explanation:

The case of the extraneous variable is most likely to be determined by the student grade level that is level of the education program that is for the grade level. This refers to all the course level and can be use to trace out the external variable that are not intentionally studied in the test or experiment and tends to affect the other variables.