They want to make sure that the answer is correct. This called peer review.
Scientists do that because they are skeptical about other scientists' work. They do not usually believe what other scientists have concluded, so other scientists come up with a hypothesis (or simply state a question) as to contradict, or theorize why another scientists' work and conclusions are wrong. In short: Scientists are skeptical and do not believe what another scientist has come up with as a conclusion.
Scientists then state another hypothesis and test it out with another experiment.
Haha but please... the most efficient method on the market is scientific consensus. That gets you the exact answers you want. We don't actually test anything anymore.
False
To test hypotheses, scientists create experiments.
Lots of different scientists test the same things to compare different conclusions.
A reference group is a scientific study of a few individuals. When scientists perform research studies, they compare the test results of the individuals with another test group.
Scientists test hypothesis by setting up an experiment. They choose a independent and a dependent variable and test the experiment.
if your referring to the scientific method, scientists test the dependent variable
It often is called a "Pap smear."
early scientists were not to test their theroies
Scientists may refer to an additional test as a "supplementary test" or "secondary test" to gather more data or verify results.