A researcher is investigating average life span during the past year. A random sample of 100 recorded deaths showed an average life span of 68.2 years. Assume that the population standard deviation is known to be 8.9 years, use 0.05 significance level to test the claim that the mean life span today is less than 70 years. Write the Null and Alternative hypothesis.

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07-06-2024
Mathematics

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A researcher is investigating average life span during the past year. A random sample of 100 recorded deaths showed an average life span of 68.2 years. Assume that the population standard deviation is known to be 8.9 years, use 0.05 significance level to test the claim that the mean life span today is less than 70 years. Write the Null and Alternative hypothesis.

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