Which of the following is true about Student's t-models?
I. They are unimodal, symmetric, and bell-shaped.
II. They have fatter tails than the Normal model.
III. As the degrees of freedom increase, the t-models look more and more like the Normal.
A) I and III
B) I, II, and III
C) I only
D) II and III
E) I and II

Question

Quizplus · Accepted Answer

Student's t-models are unimodal, symmetric, and bell-shaped (I). They have fatter tails than the Normal model, which accounts for the increased variability when estimating population parameters (II). As the degrees of freedom increase, the t-models approach the Normal distribution (III).

Which of the Following Is True About Student's T-Models