Statistics 12-1

Observational studies can prove causation ​ (a)  

• False
• true

which of the following is NOT one of the 4 principles of experimental design?

• Replicae

• Randomize

• Treatment

• Blinding

An observational study that keeps records of the gas mileage of two cars and compares them is a ___________________ study

• retrospective

• prospective

• survey

• experiment

Records are reviewed that included whether a person hjad fever during the time they had the flu to determine if most flu patients had a fever.

• survey

• Prospective

• experiment

• Retrospective

It is possible for observational studies to demonstrate a causal relationship.

• True

• False

In order to avoid the bias that might result from knowing what treatment was assigned, we use

• a census

• a random sample

• blinding

• a treatment group

·       Making conditions as similar as possible for all treatment groups is to ​ ​ ​ (a)  

• control
• Random
• blind
• replicate

In an experiment those who could influence the results and those who evaluate the results could create

• blinding

• randomization

• bias

• an Easter egg

Some experiments should not be done because they

• are too expensive

• take too much time

• are unethical

• are too difficult

The first step in an experiment is to

• Apply blindinig

• randomize the subjects

• Evaluate the results

• Decide on the treatment