statistics problem 1

(22 points) For each statement, select the correct null hypothesis, Ho, and alternative hypothesis, HA, in symbolic form. (a) It is generally believed that the population mean age of residents of Cooper County is 40 years. A sociologist believes that, in reality, the population mean is less than generally believed. In order to collect evidence, the sociologist randomly samples 100 Cooper County residents and found the sample mean age to be 38.5 years. O A. Ho : X = 40, HA : X > 40 OB. Ho : M 40 O C. Ho : x = 38.5, HA : x