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Difference between a population and a sample?
Population refers to the entire group of research which a sample is drawn whereas a sample is a group of people drawn from the population.
What is random sampling?
sampling procedure that ensures every member of the population has an equal chance of being in the sample
What is stratified sampling?
Involves dividing the population to be sampled into subgroups, then selecting a sample from each subgroup.
Experimental designs:
Matched participants, independent groups design and repeated measures design.
Potential EVs are? (5)
Placebo effect, experimenter effect, non-standardised procedures/methods, order effects, individual participant differences.
Different types of statistics? (3)
Mean, standard deviation, p-value
Difference between primary and secondary data:
Primary data is directly from the experimenter, secondary data is data that has been collected by someone other than the experimenter, usually to test their own hypothesis.
Reliability and validity
validity refers to the extent of which results measure what they're supposed to, whereas reliability refers to the extent of which results are consistent
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