9.3 \(P\)-values
Assuming the tests are statistically valid, what is the approximate \(P\)-value for a two-tailed \(t\)-test if:
- \(t = -2.14\).
- \(t = 1.90\).
- \(t = 3.15\).
- \(t = -1.20\).
- \(t = -1.59\).
- \(t = 6.71\).
(Hint: Use the \(68\)--\(95\)--\(99.7\) rule.)
How would your answers change if these \(t\)-scores came from a one-tailed test?