Question: a A new process has been developed that transforms ordinary iron into a kind of super iron called metallic glass. This new product is stronger

a A new process has been developed that transforms ordinary iron into a kind of super iron called metallic glass. This new product is stronger than steel alloys and is much more corrosion-resistant than steel. However, it has a tendency to become brittle at high temperatures. It is desired to estimate the mean temperature at which it becomes brittle. A random sample of 20 pieces of metallic glass is selected. The temperature at which brittleness is first detected is recorded for each piece. The summary results give a sample mean X of 600 C and a sample standard deviation s of 15 C. Determine whether this mean temperature exceeds 595 C. A random sample of 20 is taken, yielding a sample mean X of 600 C and a sample standard deviation s of 15 s C. Use a level of significance a of 0.05. 24 24

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