This graph shows the position of an element of air as a function of time as a sound wave passes through it.Which letter corresponds to the period of the wave? 
Definitions:
Multinomial Population
A population in statistical analysis where each member can belong to one of several or many different categories.
Classes or Categories
Distinct groups or divisions within a dataset or population, used to organize, analyze, or classify information.
Freshmen
Students in their first year of study in a secondary or post-secondary educational institution.
Significant Change
A measurable difference in data or results that surpasses the threshold of statistical significance, indicating that it is unlikely to have occurred by chance.
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