A company polled a large group of people to assess the company's reputation in the surrounding communities. to save time, the survey was mailed to the addresses of stockholders and former employees that the company already had on file and that were in the surrounding areas. which of the following statements is correct?
a. this method of sampling is neither biased nor unbiased.
b. this method of sampling is biased.
c. this method of sampling can be considered both biased and unbiased.
d. this method of sampling is unbiased.