Question
Q1. Tata Motor supplies a rear axle for Postal service mail trucks. These axles must be able to withstand 80000 pounds per square inch in
Q1. Tata Motor supplies a rear axle for Postal service mail trucks. These axles must be able to
withstand 80000 pounds per square inch in stress tests, but an excessively strong axle raises
production costs significantly. Long experience indicates that the standard deviation of the
strength of its axles is 4000 pounds per square inch. The Manufacturer selects a sample of 100
axles from production, tests them, and finds that the mean stress capacity of the sample is
79600 pounds per square inch.
i. Formulate the null and alternate hypothesis
ii. If manufacturer uses a significance level of 0.05 in testing, will the axles meet his
stress requirements? (Take Z = 1.96)
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