Homework 1 Solution

Section 14 19 there is selection bias in the sample

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Unformatted text preview: but this looks like an experiment because the researcher actively assigned individuals to treatment groups (usually, randomization is mentioned in the set ­up of an experiment). VOI: level of motion sickness, treatment group. 13) Observational study. VOI: level of mental skills, type of twin. 14) Observational study. VOI: heart disease, vitamin B group (note: all individuals had high homocysteine level, so that is actually a controlled variable). 20) This is a meta ­analysis which combines 100’s of observational studies. VOI: cancer status, presence of power lines. 23) The researchers want to see if...
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