What is a common problem in epidemiological studies?
a) They are experimental.
b) They cannot measure prevalence, only incidence.
c) They often draw on samples that are not representative of the population being studied.
d) They do not use undergraduate samples.
c
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Poverty affects a disproportionate number of _______________
Low socio economical income?
The larger the true difference between two means, the smaller power is
Indicate whether the statement is true or false
Sue is a supervisor who has a tendency to rate all of her employees as "very good" or "excellent" on the dimensions found on her graphic rating form. Sue is exhibiting the ____.?
a. ?leniency error b. ?self-serving bias c. ?halo error d. ?actor-observer bias
Although proportionate stratified sampling involves selecting individuals from predetermined subgroups of the population, it does not guarantee that each subgroup in the sample will have a large number of individuals
a. True b. False Indicate whether the statement is true or false