In conditional reasoning, the confirmation bias is a search error

In Stage __________, a new brain wave begins to appear. __________ waves are very large and slow and signal deeper sleep and a further loss of consciousness.

a. one; Alpha b. two; Delta c. three; Delta d. four; Alpha

What do changes in level indicate about treatment effects?

a) Changes in level are dependent on changes in means to show treatment effects. b) Shifts or discontinuities show the absence of treatment effects. c) Shifts or discontinuities within a phase show treatment effects. d) Shifts or discontinuities between phases show treatment effects.