An independent-measures research study uses a total of 40 participants to compare two treatment conditions. What is the df value for the t statistic for this study?

Albert is meditating. Which of the following physiological changes is he NOT likely to experience?

a. lower rate of metabolism b. increase in beta waves c. decrease in blood lactate d. reduced activity of the sympathetic nervous system

A cross-sectional and longitudinal MRI comparison of participants with schizophrenia by Lui et al. (2009 ) revealed that:

a) Participants who developed a psychotic disorder had increased grey matter volume b) Lower grey matter volume predates the onset of psychotic disorders, including schizophrenia c) Intellectual functioning was not predictive of the development of schizophrenia d) Lower grey matter volume occurs as a result of the onset of psychosis