03 ways to collect data
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15 Terms
what are the 2 ways to collect data
controlled experiment
observational study
what is a controlled experiment
experimental conditions = controlled by researcher
what is an observational study
experimental conditions are NOT controlled by researcher
what 3 things cause assoc.
causal relationship
lurking variable
coincidence
what are experimental units
people, animals or things on which experiment is conducted
what is a response
quantity that rep. outcome of experiment, for each experimental unit
what is treatment
one of experimental conditions that can be assigned to experimental unit
what is a survey
researcher determines values of attributes by asking participants
what is a population
entire group of individuals in whom are interested
what is a sample
part of pop. that we observe in study
what are the 4 principles of experimental design
control
randomise
replicate
block
what is control
control variation of extraneous factors
what is randomise
random selection minimises effects of unknown sources of variation
what is replicate
repeated experiments & those w/ larger treatment groups are more likely to be accurate
what is block
significant, but uncontrollable, sources of variation can be minimised through blocking