Sources of polling error can includeGroup of answer choicesuse of random telephone polling.unrepresentative samples.respondents' lack of knowledge or interest in the issue.question wording.All these answers are correct.

The accuracy of a poll is usually expressed in terms ofGroup of answer choicesconfidence interval error.sampling error.selection bias error.probability error.none of the above.

For validity and reliability purposes, which of the following is likely the least preferred method of conducting a poll?Group of answer choicesa news websiterandom-digit dialingfocus groupse-mailed surveys

A market research company is conducting a study to assess the likelihood of people purchasing life insurance in the Western Cape. The research team aimed to survey a sample of 500 individuals across the Western Cape. After extensive efforts, only 320 people responded to the survey, raising concerns about the representativeness of the sample. What error occurs in survey research when a significant portion of selected survey participants do not provide their responses or refuse to participate in the survey, leading to potential bias in the results? Group of answer choicesResponse errorAdministrative errorSelection errorNon-response error

Which of the following is a weakness of survey?Group of answer choicesObserver biastakes too longsampling issuewording effect

According to this class/the notes, which of the following is TRUE about non-response bias?Group of answer choicesIt is mostly a concern when the surveys are shortIt is when people stop responding towards the end of the surveyIt is when there is a systematic difference between the people who responded to the survey and the people who didn'tIt is NOT a concern when using probability sampling