The Quality Control Manager of a Tire Company Wishes to Estimate

question 79

Essay

The quality control manager of a tire company wishes to estimate the tensile strength of a standard size of rubber used to make a class of radial tires.A random sample of 61 pieces of rubber from different production batches is subjected to a stress test.The test measures the force needed to break the rubber.According to the sample results,the average pressure is 238.4 and the standard deviation is 35.Determine the 98% confidence interval.

---

Definitions:

Tri-

A prefix meaning three, used in terms referring to three parts or threefold.

Epigastric

Pertaining to the abdominal region located above the stomach.

Bilateral

Involving or affecting both sides of the body or both of a pair of organs, such as both eyes, ears, or kidneys.

Bi-

A prefix meaning two or twice, indicating duality or a pair.