When you look at the drawing below, your brain fills in the gaps so that you perceive a complete form-in this case, a square. This occurs due to the principle of ___________. 
Definitions:
Degrees of Freedom
The total number of independent pieces of information that went into the estimation of a parameter or the calculation of a statistic.
Chi-Squared Table Value
A value derived from the chi-squared distribution used in statistical tests to determine the significance of observed data.
Test Statistic
A calculated value from sample data used to make decisions about a hypothesis, indicating whether to reject the null hypothesis.
Expected Frequency
The anticipated number of times an event is predicted to happen within a specific time period, based on probability models.
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