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A certain type of hummingbird is known to have an average weight of 4.55 grams. A researcher believes that hummingbirds (of this same type) living in the Grand Canyon differ in weight from the population as a whole. The researcher finds a sample of 30 such hummingbirds from the Grand Canyon and calculates their average weight to be 3.75 grams. (Here μ represents the population mean weight of hummingbirds who live in the Grand Canyon.

A. H0:x¯=3.75,   HA:x¯>3.75 

B. H0:μ=4.55,   HA:μ<4.55 

C. H0:x¯=4.55,   HA:x¯<4.55 

D. H0:μ<4.55,   HA:μ=4.55 

E. H0:μ=4.55,   HA:μ≠4.55 

F. H0:μ=3.75,   HA:μ≠3.75

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