Question

The results of an experiment in which teaching method is the experimental treatment, used with a class of low achievers, do not generalize to heterogeneous ability students. What type of threat to validity would this be______?

Answer 1

Reduces the accuracy of external validity

Step-by-step explanation:

This is because the research is a small sample of low achiever which cannot be used to extrapolate with whole population because of different level achiever groups. To eradicate this problem, there is Need to increase the size of sample group.