What is the feature numbered 1 in the upper part of this figure? 
Definitions:
Alpha
A threshold value used in hypothesis testing that represents the level of significance, typically set at 0.05 or 0.01, indicating the probability of wrongly rejecting the null hypothesis.
Chi-square Statistic
A statistical measure used to determine if there is a significant relationship between two categorical variables.
Degrees of Freedom
The number of independent values or quantities that can vary in the calculation of a statistic.
Critical Value
A threshold in hypothesis testing that defines the boundary between the region where the null hypothesis is rejected and where it is not.
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