In research, a confound is a. the difficulty we experience in thinking of counter-examples to our beliefs. b. an alternative explanation for an outcome that comes about because more than one thing changed at the same time. c. when the outcome of a study contradicts the researcher's hypothesis. d. an instance when the actual outcome is contrary to the probabilistic prediction.

Those with high self-esteem are highly critical of their strengths and weaknesses. true or false

Germany's black forest is being destroyed as a result of which environmental issue ?

Mankiw attributes – chapter 1 and his 10 principles – differences in living standards within a countryover time and across countries at a moment in time to: a. the presence or absence of inflation and unemployment.b. the allocation of resources between private markets and the public sector.c. those that have dealt successfully with the efficiency v. equality tradeoff and those that haven’t.d. differences in productivity.e. ones that think at the margin and respond to incentives and those that don’t.