What does this diagram represent? 
Definitions:
Test Statistic
A statistic calculated from sample data, used to determine whether to reject the null hypothesis in a hypothesis test.
Null Hypothesis
The null hypothesis is a statement or assumption that there is no effect or no difference, serving as the default or starting assumption in statistical hypothesis testing.
Normal Approximation
A method used in statistics to approximate binomial distributions with normal distributions when sample sizes are large, under certain conditions.
Binomial
A statistical distribution that represents the number of successes in a fixed number of trials, with each trial having two possible outcomes.
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