The best replacement for an experiment is an observational study.


The best alternatives to an experiment are rated as following:
★★★★★  an observational study
★★  observational study
★  correlational study

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Speaking about an experiment, one probably shouldn't forget about control group.

Other search terms related to an experiment and their ratings are:

★★★★★ control group
independent and dependent variables
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Google Trends

Scale is based on the average worldwide traffic of an experiment in all years. Click on graph for more.
an experiment
an observational study
observational study