The graph below is one complete cycle of the graph of an equation containing a trigonometric function. Find an equation to match the graph. If you are using a graphing calculator, graph your equation to verify that it is correct. 
Definitions:
Population Mean
The average of all the values in a population, representing the central or typical value of the population.
Confidence Interval
A collection of values obtained from statistical samples that is expected to encompass the value of an undetermined population parameter at a given confidence level.
Margin of Error
An expression of the amount of random sampling error in a survey's results, representing the range within which the true population parameter is expected to lie.
Margin of Error
The amount of error allowed in the results of a poll or survey, reflecting the confidence in the results.
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