The average monthly rent for one-bedroom apartments in Chattanooga has been $800. Because of the downturn in the real estate market, it is believed that there has been a decrease in the average rental. The correct hypotheses to be tested are
A. H0: ?? 800 Ha: ?< 800.
B. H0: ? = 800 Ha: ?? 800.
C. H0: ?> 800 Ha: ?? 800.
D. H0: ?< 800 Ha: ?? 800.
Answer: A
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