A paper written by Alfred Wallace caused Darwin to
a. realize that his theory of natural selection was correct.
b. doubt his theory.
c. redouble his efforts to collect specimens in support of his theory.
d. publish his theory sooner than otherwise would have occurred.
e. understand that natural selection applied to all species except humans.
d. publish his theory sooner than otherwise would have occurred.
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Experiments have shown that television has little if any effect on viewer's beliefs about gender
Indicate whether this statement is true or false.
Dr. Ramos is interested in studying how indoor lighting can influence people's moods during the winter. A sample of 100 households is selected. Fifty of the homes are randomly assigned to the bright-light condition where Dr. Ramos replaces all the lights with 100-watt bulbs. In the other 50 houses, all the lights are changed to 60-watt bulbs. After two months, Dr. Ramos measures the level of
depression for the people living in the houses. Assuming that the study uses people from different age groups, participant age would be a(n) ____ variable in the experiment. a. dependent b. independent c. extraneous d. confounding