The Quality Control Manager of a Tire Company Wishes to Estimate

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.