Blaine works in a factory producing car stereos. He notices that workers produce more stereos by the end of the day when they work together in the same room than when they work in separate rooms. His observation is consistent with a classic study conducted by which researcher?

Gina believes that if she eats well, exercises regularly, and learns all she can by reading and talking to experts, she can prevent her breast cancer from returning. Gina has

a. an internal locus of control. b. a sense of perceived control. c. high self-esteem. d. a high degree of neuroticism.

Which of the following is false?

a. The average score on an example for a class is a descriptive statistic. b. A sample refers to the observations drawn from a population. c. Categorical data is also known as frequency data. d. We usually collect data from an entire population.