Question: An engineer has developed a renewable building material. He believes that the mean strength is different from the current material, which has a mean strength

An engineer has developed a renewable building material. He believes that the mean strength is different from the current material, which has a mean strength of 301.5 psi. He takes a random sample of 40 and gets a sample mean strength of 305.6 psi with a sample standard deviation of 13.4 psi. Test the his claim using a 5% level of significance.

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