Question 18. a population of students in a summer program for students in grades kindergarten to grade 8 is surveyed. which statement demonstrates sampling variability? a. in one random sample chosen from the population, the mean age was 9.4 years. in another random sample, the mean age was 9.8 years. b. in one random sample chosen from the population, the mean age was identical to that from another random sample. c. the mean age of the population is 8.8 years, and the mean age from a random sample was 9.2 years. d. in one random sample chosen from the population, the mean age was 9.4 years.