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Types of Studies

Some words will appear twice. 
Horizontales
Used to prevent bias. For example, randomly assigning numbers to participants to see which numbers are picked to get prizes
Which type of study helps us draw inferences about a population? For example, specific human behaviors
Which method can be used to obtain opinions? For example, if cats or dogs make better pets
Affects response and explanatory variables
Used when researchers are interested in learning about the effect of one variable
Allows researchers to compare how treatments, such as medicines, work compared to not taking any treatment (or medicine) at all
Subjects are unaware of which treatment they are receiving
Which type of study could be used to compare the affects of two treatments?
Verticales
What is it called when subjects in a study are all given a pill that looks the same, but there are actually two separate treatments?
Compares at least two treatments
Observe participants; no treatments or conditions
Which method is used to test a hypothesis such as "The more amount of sleep you get the better you will do in school"?
Used to get information about individuals
Receives no treatment; used for comparison
Researchers manipulate and measure the effect