In each of the following situations, state the most appropriate null hypothesis regarding the population mean μ. a) A new type of battery will be installed in heart pacemakers if it can be shown to have a mean lifetime greater than eight years. b) A new material for manufacturing tires will be used if it can be shown that the mean lifetime of tires will be more than 60,000 miles. c) A quality control inspector will recalibrate a flowmeter if the mean flow rate differs from 10 mL/s.

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In each of the following situations, state the most appropriate null hypothesis regarding the population mean μ. a) A new type of battery will be installed in heart pacemakers if it can be shown to have a mean lifetime greater than eight years. b) A new material for manufacturing tires will be used if it can be shown that the mean lifetime of tires will be more than 60,000 miles. c) A quality control inspector will recalibrate a flowmeter if the mean flow rate differs from 10 mL/s.

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