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Doing duplicates means doing the experiment / process two times. Doing triplicates means doing the experiment / process three times.
three times as many tall plants as short plants
when you toss a coin three times, the total number of possible outcomes is
There were three times as many tall plants as short plants.
Three times as many shorts plants as tall plants.
It means having a value that is three times as large.
Depending on the size/importance of the experiment, they can either simply repeat as normal or if needed gather more resources for the experiments. Scientists always perform experiments at least three times, to make sure nothing is abnormal in an experiment.
Trials are the amount of times a certain experiment is repeated.
Performing a measurement or an experiment three-times is called a triplicate. Triplicate results make statistical analysis better and prevent the possibility of unusual results due to natural/artificial variation.