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.

c

Step-by-step explanation:

sampling variability is the difference between the measured value of the random sample and the mean age of the population

answer: this is not a question

step-by-step explanation: this is a answer

answer: first option i.e. 'a' is correct.

step-by-step explanation:

since we have given that

number of minutes to wrap a small gift box = 4 minutes

we need to find the number of gifts to be wrapped in 5 minutes

since there is a direct variation, as the number of minutes will increase with   number of gifts to be wrapped.

so, let the number of gifts to be wrapped in 5 minutes be x.

so, it becomes,

hence, first option 'a'   is correct.