Use the following to answer questions
A researcher wanted to determine if using an octane booster would increase gasoline mileage. A random sample of seven cars was selected; the cars were driven for two weeks without the booster and two weeks with the booster. Use the definitions of X1 and X2 as given in the table. Consequently, D = X1-X2. 
-State the alternative hypothesis?
Definitions:
Pubic Hair
Terminal body hair that becomes more prominent during and after puberty, typically found in the genital area.
Facial Beard
Hair growth on the chin, cheeks, and neck area of a person's face, typically observed in adult males.
Major Switching Station
Refers broadly to any neural structure that acts as a hub for transmitting signals from various parts of the body or brain to their intended destinations, crucial in the processing of sensory inputs and motor outputs.
Thalamus
A structure in the brain that acts as a relay station for sensory and motor signals to the cerebral cortex, playing a key role in regulating consciousness, sleep, and alertness.
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