A Mining Company Made Some Changes to Their Mining Process

question 32

Essay

A mining company made some changes to their mining process in an attempt to save fuel. Before the changes were made, it took an average of 20 gallons of diesel fuel to mine 1,000 pounds of copper. Suppose the standard deviation of fuel used per 1,000 pounds of copper mined is 6 gallons. After the changes were made, the company only used an average of 18 gallons of diesel for the next 30,000 pounds of copper mined.
A) How unusual would it be to get a sample average of 18 gallons or less for 30,000 pounds of copper mined if the changes to the mining process had no effect?
B) Do you think the changes in the mining process actually lowered the fuel used? Explain.

• A) How unusual would it be to get a sample average of 18 gallons or less for 30,000 pounds of copper mined if the changes to the mining process had no effect?
• B) Do you think the changes in the mining process actually lowered the fuel used? Explain.

---

Definitions:

Identical Twins

Twins that result from a single fertilized egg dividing and developing into two individuals with almost entirely the same genetic makeup.

Fraternal Twins

Twins that develop from two different eggs fertilized by two different sperm cells, making them genetically unique from each other.

Adopted Children

Adopted children are those who have been legally taken into a family different from their birth parents, and raised as a member of that family.

Biological Parents

The individuals from whom one has inherited genetic material, typically referred to as a biological mother and father.