Suppose I am interested in knowing whether adults who are very introverted at age 20 are still highly introverted at age 50. Which of the following statistical analyses will I be most likely to use?
a. a comparison of average introversion scores for a sample of adults aged 20 and another sample aged 50
b. a comparison of average introversion scores at age 20 and age 50 for the same adults assessed longitudinally
c. an analysis of the average amount in introversion between any two measurements of the same people over time
d. a calculation of the correlation between scores on the key variable at two time points in a group of subjects studied longitudinally between age 20 and age 50
d
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When Sophia flies across the country for work meetings, traversing several time zones, her circadian rhythm is likely to be interrupted by
A) jet lag. B) sleep deprivation. C) sleep debt. D) REM rebound.
The gate-control theory of pain suggests that
a. the pain signals must pass through a kind of "gate" located in the spinal cord. b. the skin receptors act as a gate for the pain sensation. c. the cortex blocks pain unless released by substance P. d. the gate is a physical structure that blocks pain signals. e. there are mechanisms at each level of the brain that can selectively block pain. messages.