Environmental challenges pose a threat to international security because they ______.
a. reduce the supply of food, clean water, and other vital resources
b. lead to disputes over the seriousness of climate change
c. discourage nations from cooperating to address common challenges
d. distract nations from pressing political and economic issues
a. reduce the supply of food, clean water, and other vital resources
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To determine if families with children would use school vouchers to send their children to charter schools, from which of the following populations should you select a sample?
a. women with children b. citizens in the school district— c. parents d. parents of children under age 18
When researchers are planning medical research with experimental and placebo groups, it is true that
a. they can withhold treatment in a research project as long as they report it in their research report. b. they are not allowed to put participants at risk by withholding treatment even if millions of people will later benefit from the research results. c. they can withhold treatment from the placebo group only if the treatments being used have not been systematically tested before. d. they can prescribe experimental treatments without patient knowledge only if there is a 95% chance or greater that the new treatment will work.