Refer to the diagram,which shows three demand curves for coffee.Which of the following would cause the change in the demand for coffee illustrated by the shift from D1 to D2? 
Definitions:
Sample Size
Refers to the number of observations or data points collected in a sample from a population for the purpose of statistical analysis.
Level of Significance
The threshold chosen by the researcher which determines the probability at which the null hypothesis will be rejected, often denoted by alpha (α).
Operating Characteristic
A function or curve that describes the discriminating ability of a test across various conditions or thresholds.
Sample Size
The number of individuals, observations, or data points collected or selected from a population for the purpose of analysis.
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