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When subjects have very different characteristics from one another, they are known as a ______________ sample in research.

The principle of falsifiability refers to the idea that

Susan conducts a study to determine which therapy method (behavioral, cognitive, or humanistic) is most effective in treating depression. Each participant receives two months of each therapy in a different counterbalanced order. Susan finds that whatever type of therapy is last produces the most benefits. Susan has encountered a problem known as

Why is it important to use operational definitions in research?

A ________ research hypothesis specifies the outcome of an experiment.

What is the dependent variable in the following statement? “If people are put in groups, then they will be less likely to help a stranger than when they are by themselves.”

What type of statistics is used to organize and describe the characteristics of a collection of data?

Name and define one technique/strategy that you would use to control extraneous variables in your study. Be sure to identify which strategy you would use (1 point), and how you would apply it in this specific example (1 point). 

Dawn chose to use college students as her participants because most past research does as well. Dawn used _______ in choosing her participants.