In attempting to study police officers' attitudes toward their supervisors, Alex surveys 25 police officers working in the day shift. In this case, what can help Alex ensure that his findings have external validity

Which of the following statements is true? a)free trade causes contraction of the export-oriented sector. b)free trade causes contraction in the import-competing sector. c)free trade restricts consumption choices of the domestic consumers. d)all the domestic producers benefit when a country engages in free trade.

What words in the preamble to the constitution reflect the principle of popular sovereignty

How do corporate finances, investor expectations and external forces influence stock prices and possibly pose a risk to investors