Final answer:
The motivation and intelligence of the students participating in the new and the regular history programs would be considered confounding variables.
Step-by-step explanation:
The motivation and intelligence of the students participating in the new and the regular history programs would be considered confounding variables.
A confounding variable is a variable that is not the main focus of the study, but still affects the relationship between the independent and dependent variables.
In this case, the motivation and intelligence of the students could potentially impact the results of the study.
If the students in the problem-based history program are more motivated or have higher intelligence than those in the regular history program, it could confound the results and make it difficult to determine if the program itself is superior.