Final answer:
False The part of the model that is being tested is referred to as the reduced model.
Step-by-step explanation:
The statement in the question is FALSE. The part of the model that is being tested is actually referred to as the alternative model or alternative hypothesis.
In hypothesis testing, the reduced model refers to the null hypothesis, which is the model that assumes there is no relationship or effect.
For example, if you're testing the effectiveness of a new drug compared to a placebo, the null hypothesis would state that there is no difference between the two treatments. The alternative model or alternative hypothesis would then be that the new drug is effective.