The objective of a statistical process control (spc) system is to a. assess customer expectations. b. provide a statistical signal when assignable causes of variation are present. c. provide a statistical signal when natural causes of variation are present. d. eliminate natural variations.

Francine, a college freshman, has agreed to participate in a psychology research study. before she begins her participation, she reads a statement written by the researcher explaining the purpose of the research and the potential risks of participation. it also explains that francine is free to withdraw from the research at any time. in providing francine with this statement, the researcher has followed the ethical guidelines of for participants.