Norms for a new test of mental ability were obtained from a large sample of the general population. The mean of the test was set to 100 and the standard deviation was 15. Approximately what percentage of the population would fall within the range bounded by scores of 85 and 115?
a. 20 percent
b. 68 percent
c. 2 percent
d. 98 percent
Question 2
In Gestalt psychology, learning, especially problem solving, is accomplished primarily by _____.
A) repetition
B) insight
C) continuous practice
D) mechanical reinforcement
World human population growth through history illustrates an exponential growth pattern.
Population predictions for 2000–2050, using three different total fertility rates (
The Normal Distribution of Scores for a Standardized Intelligence Test
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A test of Yanofsky’s proposed trp operon gene map