A market researcher selects 500 people from each of 10 cities.

Question 25 options:

a)	Systematic

b)	Stratified

c)	Simple random

d)	Convenience

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Which of the following quantities of interest would be the most difficult to measure?

Question 26 options:

a)	The best looking team member

b)	The team member with the longest hair

c)	The average height of a volleyball team

d)	The team member with the highest salary

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A pharmaceutical company conducted a study to test the effectiveness of its new anti-depression medication. 500 adults suffering from depression were selected at random and were randomly assigned to either a treatment group or a placebo group. The experiment was double blind. The results were analyzed by the company.

Question 28 options:

a)	Variables are difficult to define/measure

b)	Selection bias

c)	The setting may not encourage honest responses

d)	The source of the study

e)	Confounding variables

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Which of the following describes a study in which the patients do not know whether they are receiving the treatment or the placebo but the experimenters do know?

Question 29 options:

a)	Case-control study

b)	Single-blind experiment

c)	Observational study

d)	Double-blind experiment

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