Question

a sample of 621 residents from a community were surveyed about proposed improvements to the communitys park. which of the following must be true to allow the results of the survey to be generalized to all the residents from the community?
i. at least half of the residents from the community were sampled.
ii. the sample was selected at random.
(a) i only
(b) ii only
(c) i and ii
(d) neither i nor ii

Explanation:

To generalize survey results to an entire population, the sample must be representative. A random sample helps ensure representativeness. The size (whether half are sampled) is not the key factor for generalizability; random selection is.

Answer:

B. II only