In a normal distribution, what percentage of people scores within two standard deviations of the average?

Your sister came home from a pediatrician's visit with your 9-year-old nephew and was very worried because the doctor told her that your nephew has myopia. She was also very unhappy because the pediatrician failed to give her medication to treat it. What would you tell her about myopia?

a. It simply means nearsightedness. b. It is an intense fungal infection of the sclera. c. It results in permanent retinal damage. d. It is a disease of the eye that occurs only in children with cancer.

Ultrasound can be used to detect

a. Klinefelter syndrome. b. cystic fibrosis. c. PKU. d. position of the fetus.