Hypotheses are typically expressed as

Metcalfe and Wiebe gave participants problems to solve and asked them to make "warmth" judgments every 15 seconds to indicate how close they felt they were to a solution. The purpose of this experiment was to

a. demonstrate a difference between how people solve insight and non-insight problems. b. show how people progress through the problem space as they solve a problem. c. show that some problems are easier to solve than others. d. measure the time-course of solving well-defined versus ill-defined problems.

A researcher conducts an experiment on a new drug for enhancing memory and the researcher concludes that the drug is effective. However, by chance alone the many participants having excellent memories were placed in the experimental group. This may lead to a:

a. Type I error. b. Type II error. c. correct rejection. d. correct acceptance.