(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. H = 69, H : > 69 B. Ho=71, Ha : < 71 c. Ho=69, D. Ho : = 71, E. Ho = 69, OF. Ho: >69, Ha: > 69 Ha : < 71 Ha: 69 H < 69 :