The graph displays the number of students enrolled in mathematics class for the number of days since registration opened. Calculate the slope for the line and interpret its meaning. 
Definitions:
Wilcoxon Signed-Rank Test
A nonparametric test used to compare paired or matched samples to assess whether their population mean ranks differ.
Nonzero Difference
A term indicating that there is a measurable or meaningful difference between two entities or measurements.
Tied Values
Occurs when two or more observations have the same value in a set of data, often requiring special consideration in statistical analyses.
Aptitude Tests
Standardized tests designed to measure an individual's potential to acquire skills or knowledge.
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