Chapter 8.3, Problem 1LC

A research report includes the statement, “z - 2.18. p <.05.” What happened in the hypothesis test?

1. a. The obtained sample mean was very unlikely if the null hypothesis is true, so H₀ was rejected.
2. b. The obtained sample mean was very likely if the null hypothesis is true, so H₀ was rejected.
3. c. The obtained sample mean was very unlikely if the null hypothesis is true, and the test failed to reject H₀.
4. d. The obtained sample mean was very likely if the null hypothesis is true, and the test failed to reject H₀.