Refer to the information provided in Figure 3.7 below to answer the following question(s) . 
Figure 3.7
-Refer to Figure 3.7. If pizza and hamburgers are substitutes, an increase in the price of hamburgers will cause a movement from Point B on demand curve D2 to
Definitions:
Pooled Variance
A method used in statistical analysis to estimate the variance of two or more different populations by pooling their variances, assuming they have the same variance.
Sample Sizes
The number of observations or units chosen from a larger population for the purpose of statistical analysis.
Weighted Average
An average resulting from the multiplication of each component by a factor reflecting its importance.
Z-score
A numerical metric indicating how a particular value compares to the average of a dataset, expressed by the number of standard deviations it lies from the mean.
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