public HistogramAssert usingHypothesisTester(HypothesisTester tester) {
			this.tester = requireNonNull(tester);
			return this;
		}
Use the given hypothesis tester for checking the observation.

@param tester the hypothesis tester to use
@return {@code this} assertion object
jenetics.incubator/src/main/java/io/jenetics/incubator/stat/Assurance.java