Questions to Ask Before You Believe a Pol Essay Example for Free

Questions to Ask Before You Believe a Pol EssayOpinion summits and other exemplar canvass raft produce accurate and reusable information if the pollster uses good statistical techniques and also works hard at preparing a sampling frame, wording questions, and minify nonresponse. Many surveys, however, especi all toldy those designed to influence public opinion rather than just record it, do not produce accurate or useful information. Here are some questions to ask before you pay much attention to poll results.Who carried come out of the closet the survey? Even a political company should hire a professional sample survey firm whose reputation demands that they follow good survey practices. What was the population? That is, whose opinions were being sought? How was the sample selected? smelling for mention of random sampling. How large was the sample? Even better, find out both the sample size and the margin of error within which the results of 95% of all samples drawn as this one was would fall. What was the response rate? That is, what percent of the original subjects actually provided information? How were the subjects contacted? By telephone? Mail? Face-to-face interview? When was the survey conducted? Was it just after some event that might have influenced opinion? What were the exact questions asked?Academic survey centers and government statistical offices answer these questions when they announce the results of a sample survey. National opinion polls usually dont announce their response rate (which is often low) but do give us the other information. Editors and newscasters have the bad habit of cutting out these dull facts and reporting only the sample results. Many sample surveys by interest groups and topical anesthetic newspapers and TV stations dont answer these questions because their polling methods are in fact unreliable.If a politician, an advertiser, or your local TV station announces the results of a poll without complete informati on, be skeptical. Even professional sample surveys dont give exactly correct information about the population. There are umteen potential sources of error in sampling. The margin of error announced by a sample survey covers only random sampling error, the variation cod to chance in choosing a random sample. Other types of error are in addition to the margin of error and cant be instanter measured. Sampling errors come from the act of choosing a sample. Random sampling error and undercoverage are common types of sampling error.Undercoverage occurs when some members of the population are left out of the sampling frame, the list from which the sample is actually chosen. The most serious errors in most careful surveys, however, are non-sampling errors. These have nothing to do with choosing a samplethey are present even in a census. The single biggest problem for sample surveys is nonresponse subjects cant be contacted or refuse to answer. Mistakes in discourse the data (processing errors) and incorrect answers by respondents (response errors) are other examples of non-sampling errors.