Question

(6 points) For each statement, select the correct null hypothesis, Ho, and alternative hypothesis, Ha, in symbolic form. (a) According to the Merck Veterinary Manual, the average resting heart rate for a certain type of sheep dog is 115 beats per minute (bpm). A Montana farmer notices his aging sheep doa has been acting more lethargic than usual and wonders if her heart rate is slowing. He measures her heart rate on 15 occasions and finds a sample mean heart rate of 118.2 bpm. Remaining time: 84:28 (min:sec) O A. Họ : x = 115, H. :<> 115 B. Ho:u= 115, H,:u < 115 OC. HỌ : 4 = 115, HQ:44 115 D. Hou = 118.2, H:4 < 118.2 E. Ho : x = 118.2, H:16 118.2 F. Hou = 115, Hlu > 115 (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. Hou > 69, Ha: u < 69 B. H. :* = 69, H,:> 69 C. H : x = 71, H:i< 71 OD. H : u = 71, H,:< 71 E. HO : u = 69, H,:> 69

Answer 1

(a) The null and alternative hypothesis is ,

$H_0:\mu=115$

$H_a:\mu\neq 115$

(b) The null and alternative hypothesis is ,

$H_0:\mu=69$

$H_a:\mu>69$

(c) The null and alternative hypothesis is ,

$H_0:\mu=4.55$

$H_a:\mu\neq 4.55$