Use the table for the question(s)below.
Consider the following returns: 
-Calculate the correlation between Stock Y's and Stock Z's returns .
Definitions:
Sales Mix
Sales mix refers to the combination of different products or services that a company sells, impacting the overall profitability depending on the profit margin of each product or service.
Variable Expenses
Expenses that fluctuate with the level of output or activity, in contrast to fixed expenses that remain constant regardless of activity level.
Net Operating Income
The earnings a business retains after subtracting operational costs, prior to the deduction of interest and taxes.
Total Contribution Margin
The difference between a company's sales revenue and variable costs, representing the amount available to cover fixed costs and contribute to profit.
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