4 points) For each statement, select the correct null hypothesis, H0 , and alternative hypothesis, Ha , in symbolic form. (a) 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. H0:x=3.75 , Ha:x>3.75 B. H0:=3.75 , Ha:3.75 C. H0:=4.55 , Ha:4.55 D. H0:=4.55 , Ha:115 B. H0:=115 , Ha:115 (c) 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. H0:>69 , Ha:6