Types of statistical studies

The topic of  is under the Probability and statistics Math Mission. This exercise explores the differences and similarities between experiments and studies.

Types of Problems
There is one type of problem in this exercise:


 * 1) Determine type of study and valid conclusion: This problem describes a situation where someone is interested in a question and performs a study. The student is asked to determine what type of study was performed and whether or not the study answered the question for which it was intended (with justification).Statstud1.png

Strategies
This exercise is hard to get accuracy badges because the detail and differences between studies and experiments is subtle. Furthermore, the conclusions are also similar, though there is always one that is more correct. The speed badges are hard because it takes a long time to read the problem carefully and make sure that you are selecting the right choices.
 * 1) An experiment generally requires a control group, randomization, and a treatment that is being performed.
 * 2) An experiment can give evidence of a causal relationship.
 * 3) Studies cannot determine causation, but they can be used to determine positive or negative correlation between variables.