1. Sampling Designs

2. Non-Probabilistic Sampling Designs:
Convenience Sample
Voluntary Response Sample
Haphazard Sample

3. Probabilistic Sampling Designs:
SRS (Simple Random Sample)
Stratified Sample
Cluster Sample
Systematic Sample
In each sampling design, randomization is involved, i.e. every one has an equal chance of being chosen
SRS is the only method that ensures that every sample of size n has an equal chance of being chosen.

4. Period 1: CW Responses VictoR, Hadley
Researchers will be able to differentiate between the effect of the treatment from the body’s natural ability to lower its blood pressureas illustrated by the placebo effect. Researchers can see how effective themeds really are.

5. Period 1: CW Responses Nick, Courtney Drosjack
The disadvantage of having volunteers is that if someone with lower blood pressure than another participant might react poorly to the medicine or might not need to be on the medicine as long.

6. Period 1: CW Responses Courtney Dowell, Rachel
Because it was distributed randomly, it could be blind but the experiment did not specify if the researchers knew which volunteers got which treatment, unsure

7. Period 5: CW Responses Ali & Maggie
You would get an unregulated variety of blood pressures, ages, genders, and other health issues.

8. Period 5: CW Responses Maria & Erika
Blind from the patients point of view if they do not know what they are getting.

9. Period 6: CW Responses Eric and Addy
The placebo creates a control group and accounts for the mental effects of taking medication.

10. Period 6: CW Responses Denver & Mary
Only people who admit that they have high blood pressure will join. (cannot generalize results)

11. Period 6: CW Responses Julian & Nilu
Yes, because the volunteers don’t know what they are taking (placebo or meds – pills look the same) or how much.
Double Blind: ppl issuing meds don’t know what it is (placebo vs meds)