8. Find the critical value of t from
a table (at the back of many statistics books;
also on my website).
(a)
“Two-tailed test”: if we are predicting a
difference between tests A and B (i.e., merely
saying that A and B differ)
find the critical value of t for a
"two-tailed" test. With 9 d.f., critical value
= 2.26.
(b)
“One-tailed test”: if we are predicting that A is bigger than
B, or A is smaller than
B, find the critical value of t for a
"one-tailed" test. For 9 d.f., critical
value = 1.83.
critical values of
t (two-tailed):
