(b) The mean height of all adult American males is 69 inches (5 ft 9 in). A researcher wonders if young American males between the ages of 18 and 21 tend to be taller than 69 inches. A random sample of 100 young American males ages 18 to 21 yielded a sample mean of 71 inches. A. ?0:?¯???71H0:x¯geq71, ??:?¯<71 Ha:x¯<71 B. ?0:?≤69H0:μ≤69 , ??:?>69 Ha:μ>69 C. ?0:?≥71H0:μ≥71, ??:?<71 Ha:μ<71 D. ?0:?>69H0:μ>69, ??:?<69 Ha:μ<69 E. ?0:?¯≤69H0:x¯≤69, ??:?¯>69 Ha:x¯>69 F. ?0:?=69H0:μ=69, ??:?≠69 Ha:μ≠69
(b) The mean height of all adult American males is 69 inches (5 ft 9 in). A researcher wonders if young American males between the ages of 18 and 21 tend to be taller than 69 inches. A random sample of 100 young American males ages 18 to 21 yielded a sample mean of 71 inches.
A. ?0:?¯???71H0:x¯geq71, ??:?¯<71 Ha:x¯<71
B. ?0:?≤69H0:μ≤69 , ??:?>69 Ha:μ>69
C. ?0:?≥71H0:μ≥71, ??:?<71 Ha:μ<71
D. ?0:?>69H0:μ>69, ??:?<69 Ha:μ<69
E. ?0:?¯≤69H0:x¯≤69, ??:?¯>69 Ha:x¯>69
F. ?0:?=69H0:μ=69, ??:?≠69 Ha:μ≠69
(c) A certain type of hummingbird is known to have an average weight of 4.55 grams. A researcher wonders if 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.
A. ?0:?=3.75H0:μ=3.75, ??:?≠3.75 Ha:μ≠3.75
B. ?0:?≥4.55H0:μ≥4.55, ??:?<4.55 Ha:μ<4.55
C. ?0:?¯≤3.75H0:x¯≤3.75, ??:?¯>3.75 Ha:x¯>3.75
D. ?0:?<4.55H0:μ<4.55, ??:?=4.55 Ha:μ=4.55
E. ?0:?=4.55H0:μ=4.55, ??:?≠4.55 Ha:μ≠4.55
F. ?0:?¯≥4.55H0:x¯≥4.55, ??:?¯<4.55 Ha:x¯<4.55
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