Suppose a store manager wants to know the demand y for an energy bar as a function of price x. The daily sales for three different prices of the energy bar are shown in the table. Use the regression capabilities of a graphing utility to find the least squares regression line for the data. 
Definitions:
Joint Products
Products that are produced together from the same process or production system, each yielding revenue.
Product Costs
The costs directly associated with the production of goods, including direct labor, materials, and manufacturing overhead.
Weighted Average Method
An inventory costing method that calculates the cost of goods sold and ending inventory based on the weighted average cost of all items available for sale during the period.
Joint Costs
Costs incurred in the process of producing two or more products simultaneously, where the costs cannot be separated easily for each product.
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