1.

(a) Look up and write down the t cutoff at the .05 level (two-tailed) for 5, 10, 15, and 20 degrees of freedom.

(b) Square each t cutoff and write it down next to the t.

(c) Look up and write down, next to the squared ts, the cutoffs for F distributions with 1 degree of freedom in the numerator and 5, 10, 15, and 20 degrees of freedom as the denominators. (The results should be identical, within rounding error.)