In a psychology class of 100 students, test scores are normally distributed with a mean of 80 and a standard deviation of 5 . Approximately what percentage of students have scores between 70 and 90?
a. 68%
b. 80%
c. 95%
d. 99%
c
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All you know about a girl is that she is 14 years old. According to Erikson's theory of life span development, she is probably facing the crisis of
a. competence vs. inferiority. b. intimacy vs. isolation. c. identity vs. role confusion. d. autonomy vs. self-doubt.
In graphing frequency distributions, _________ is usually plotted on the abscissa
a. frequency c. the score value b. class width d. interval width
Wearing a helmet can reduce the risks of head and brain injuries by as much as_____ percent
A) 40 B) 55 C) 70 D) 85
Sickle-cell disease
a. occurs in individuals who have one allele for normal blood cells and one allele for sickle-shaped cells. b. is not an inherited disorder. c. is not a serious health problem because it is easily cured. d. is becoming less common in successive generations of African Americans.