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In order to increase the production of gas wells, a procedure known as “hydraulic fracturing” is often used. Fracture fluid, which consists of fluid mixed with sand, is pumped into the well. The following figure presents a
- a. From the least-squares line, estimate the production for a well into which 4000 gal/ft are pumped.
- b. From the least-squares line, estimate the production for a well into which 500 gal/ft are pumped.
- c. A new well is dug, and 500 gal/ft of fracture fluid are pumped in. Based on the scatterplot, is it more likely that the production of this well will fall above or below the least-squares estimate?
- d. What feature of the scatterplot indicates that assumption 3 on page 544 is violated?
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