If every 1 Oth student on a nonalphabetized list of names was chosen from your school to answer a survey, this group would be a(n):
OA. random sample.
O B. independent sample.
O C. biased sample.
O D. experimental sample.

To check their medical records to see if they have had chicken pox before, if they haven’t, monitor their temperature, drink plenty of fluids, and stay away from small children and those who haven’t been exposed to chicken pox during the incubation period.

This is d. air quality index. hope this !