After the age of 2, what is the maximum number of hours per day of quality television that the American Academy of Pediatrics recommends for children?
a) 1 to 2 hours
b) 2 to 3 hours
c) 3 to 4 hours
d) 4 to 5 hours
Answer: a
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Which change in vision occurs during middle adulthood?
A. improved depth perception B. decline in distance perception C. presbyopia lessens D. the ability to view items in two dimensions increases
Reactivity is a research problem because when it occurs,
A. observers may record only the observations that are consistent with their expectations. B. people's behavior may not represent their typical behavior. C. relevant information may be lost from archival records. D. there will be a spurious relationship between variables
Placing a disruptive child in time out where the child is in a restrictive environment and completely isolated from either teacher or peer approval illustrates the use of
a. negative reinforcement. c. extinction. b. positive reinforcement. d. none of these.
Which of the following is not one of the assumptions of the t-test for independent samples?
a. The populations of raw scores form normal distributions. b. Their dependent scores measure an interval/ratio variable. c. There is homogeneity of variance. d. The standard deviation of at least one of the populations is known.