Chapter 8.3, Problem 143E

a.

To determine

To explain: The reason for not providing the entries for all possible entries of degrees of freedom.

b.

To determine

To explain: The reason for the consideration of consecutive entries for small degree of freedom and only selected entries for large degrees of freedom.

c.

To determine

The critical value $\left(t_{0.05}\right)$ for degrees of freedom $d.f=87$.

The critical value $\left(t_{0.05}\right)$ for degrees of freedom $d.f=125$.

The critical value $\left(t_{0.05}\right)$ for degrees of freedom $d.f=650$.

The critical value $\left(t_{0.05}\right)$ for degrees of freedom $d.f=3,000$.