The minimum number of data points that an experiments should gather is 3 points.
Data points are discrete units of information in a scientific experiment. In statistics or even scientific experiments a data point is determined by measurement or research and may be represented numerically or graphically.
Data points may also refer to information that is gathered in a scientific experiment, that needs to be analyzed for the purpose of deriving possible results or conclusions. An experiment requires a minimum of three data points from which a graphical representation can be obtained from.
