A researcher may use __________ sampling to sample a social network of people or linked ...

A researcher may use __________ sampling to sample a social network of people or linked organizations.
 
  Fill in the blanks with correct word

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A cause variable is the independent variable, and the result effect variable is a dependent variable. A third type of variable, __________, appears in complex relations and shows a link between the independent and dependent variables.
 
  Fill in the blanks with correct word

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Dr. Van Offer is studying a new communication method. If he uses the new technique in a
 
  randomized study, it would be the
 
  A) dependent variable. B) independent variable.
  C) placebo. D) control group.

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This type of sampling is easy, cheap and fast, but its biggest problem is that it can produce very unrepresentative samples and lacks depth. __________ is a nonsystematic selection method that often produces samples very unlike the population.
 
  Fill in the blanks with correct word

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When using a true random process, over the long run the odds are
 
  A) that the researcher tires of the experiment.
  B) all the people in the groups will be different.
  C) the people in the groups will be equal.
  D) even.