(Solution) - In each of the following situations state the most appropriate -(2025 Original AI-Free Solution)

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In each of the following situations, state the most appropriate null hypothesis regarding the population mean ?.
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?