which of the following research methods does not permit researches to draw conclusions regarding cause-and-effect relationships?

A random sample can best be defined

the observation in a classroom that the higher the room temperature, the lower student performance would be an example of :

in an experiment, Sydney is going to investigate how alcohol affects aggression: The number of alcoholic drinks the subject has in called:

If a researcher is trying to establish a causal relationship between eating breakfast and work performance, the researcher should use which of the following methods of research?

The I-knew-it-all-along bias is also called:

Statement of procedures (operations) used to define research variables (procedures)

When someone is told something and believes this something during the experiment which causes them to act like this something even if the something never existed

Statistical statement of how likely it is that an obtained result occurred by chance

When both participants and experimenter don't know who's in the experimental group or control group

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