The average life expectancy of tires produced by Whitney Tire Company has been 40,000 miles. Management believes that due to a new production process, the life expectancy of its tires has increased. In order to test the validity of this belief, the correct set of hypotheses is _____
a. H0: ? < 40,000 Ha: ? ? 40,000
b. H0: ? ? 40,000 Ha: ? > 40,000
c. H0: ? > 40,000 Ha: ? ? 40,000
d. H0: ? ? 40,000 Ha: ? < 40,000
b
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