The Quality Control Manager of a Tire Company Wishes to Estimate

question 128

Multiple Choice

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 (in pounds) needed to break the rubber.According to the sample results,the average pressure is 238.4 pounds with a population standard deviation of 35 pounds.Determine the 98% confidence interval.

• A)[227.96 248.82]
• B)[236.64 240.16]
• C)[233.63 243.17]
• D)[229.21 247.59]

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