Tuesday, April 16, 2019

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

Questions to Ask Before You Believe a Pol EssayOpinion polls and different sample surveys can produce ideal and useful information if the pollster uses good statistical techniques and in any case works hard at preparing a consume frame, wording questions, and reducing nonresponse. Many surveys, however, especially those knowing to influence public intuitive feeling rather than just record it, do not produce accurate or useful information. Here ar some questions to ask before you pay much fear to poll results.Who carried out the survey? Even a political party should hire a sea captain sample survey firm whose reputation demands that they follow good survey pr travelices. What was the population? That is, whose opinions were being sought-after(a)? How was the sample selected? Look for mention of random sampling. How large was the sample? Even better, find out twain the sample size and the margin of error within which the results of 95% of all samples drawn as this wiz w as 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 stock-stillt that might have influenced opinion? What were the fill 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 take overt announce their response rate (which is often low) but do birth us the other information. Editors and newscasters have the bad habit of cutting out these dull facts and reportage only the sample results. Many sample surveys by interest groups and local newspapers and TV posts 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 information, be sk eptical. Even professional sample surveys dont give exactly correct information about the population. There are many potential sources of error in sampling. The margin of error announced by a sample survey covers only random sampling error, the variation due to chance in choosing a random sample. Other types of error are in addition to the margin of error and cant be directly 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 close to 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 dare to answer. Mistakes in handling the data (processing errors) and i ncorrect answers by respondents (response errors) are other examples of non-sampling errors.

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