The purpose of deriving a standard deviation of a distribution is
A. to determine the central value of the scores in a distribution.
B. to determine the range of scores in each of the quartiles of a distribution.
C. to determine the dispersion of scores around the mean of a distribution.
D. to average all the scores in a distribution.
Answer: C
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What evidence indicates a genetic influence on sexual orientation? a. Homosexuality is more common among men who had an older brother
b. One gene on the Y chromosome is strongly correlated with sexual orientation. c. Most gay men and lesbian women have at least one homosexual parent. d. Monozygotic twins share the same orientation more often than dizygotic twins do.
The scientific approach requires that people specify exactly what they are talking about when they formulate hypotheses. Which advantage of scientific investigation does this illustrate?
a. precision b. acceptance of a degree of error c. skepticism d. operational definitions
Dr. Zheng is looking at the PET scans of four different people. She has been asked to identify the individual who was learning something new and difficult when the PET scan was performed. She should look for the PET that indicates ____.?
a. ?high activity in the frontal lobe b. ?high activity in the hippocampus c. ?low activity in the occipital lobe d. ?low activity in the medulla
By the time children enter first grade, their body proportions resemble those of older children
Indicate whether the statement is true or false