Which of the following is NOT a rule for constructing a simple frequency distribution?
A. The number of intervals should equal the number of values measured.
B. Each interval is equidistant.
C. No class interval overlaps.
D. At least five class intervals are included.
Ans: A
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A study of Brazilian children who worked as street vendors found that the children could
a. accurately perform simple arithmetic when buying and selling but could not do similar written math problems like those in school. b. seldom give correct change. c. give correct prices on orders that required multiplication just as quickly as schooled children. d. count money but not numbers.
A picture book dealing with how plants change sunlight into food is a. fiction
b. nonfiction. c. predictable. d. a novelty book.
It has been determined that 30 percent of a test's total variance is error. What is the test's reliability coefficient?
a. .30 c. .70 b. .60 d. .75
One of the criticisms that has been leveled at research that examines the similarity between twins separated at birth is that
A. there are so few cases of separated twins that this research cannot really tell us very much about the relative influence of genetics and environment. B. in many cases the twins were not really separated because they were adopted by relatives or lived close to each other while growing up. C. we do not yet have statistical techniques that allow us to separate the effect of genetics from the effect of the environment. D. many of the reports of great similarity between separated twins has been exaggerated and these reports are not supported by data.