Which of the turning points are peaks? The following data give the dates of successive turning points in U.S.economic activity and the corresponding levels of real GDP at the time. 
Definitions:
Margin of Error
A statistic expressing the amount of random sampling error in a survey's results, indicating how much the survey results may deviate from the actual population values.
Construct Validity
The degree to which a test measures what it claims to measure, reflecting the accuracy of the concept being evaluated.
Systematic Bias
A consistent and repeatable error in judgment or decision-making that deviates from accuracy due to certain predetermined factors.
Random Sampling Error
The error in statistical analysis that results from the selected sample not perfectly representing the entire population.
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