This class defines a graph used in interval estimation and hypothesis testing experiments, such as the mean estimate experiment. The graph shows the density of specified distribution and an interval along the x-axis. The value of a test statistic is shown as a vertical line. The event of interest is whether this value falls in the specified interval. The class has methods for getting and setting the colors, the test value, and the lower and upper bounds of the interval. The class inherits a method for getting and setting the distribution.
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