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Understanding Sampling Methods and Bias in Survey Research

Exploration of sampling techniques and bias in surveys.

David Brown
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Understanding Sampling Methods and Bias in Survey ResearchPoints Awarded9.00Points Missed1.00Percentage90.0%1.A census differs from a sample survey becauseA)a sample survey is only done when measuring the units will destroy them.B)acensus is only done when measuring the units will destroy them.C)in a sample survey the whole population is measured.D)in a census the whole population is measured.Feedback:A census is designed to measure the entire population while a sample is a subgroup of thepopulationPoints Earned:1.0/1.02.When a representative sample is selected but respondents give answers that are different from their trueopinions, the problem is calledA)lack of accuracy.B)selection bias.C)nonresponse bias.D)response bias.Feedback:Response bias is the result of respondents providing answers that are not necessarily theirtrue opinions but instead are opinions they believe the researcher wants to hear or when respondents areafraid to say their true thoughtsPoints Earned:1.0/1.03.For a survey of American diets a random sample of 1000 people were contacted. Of the 1000 people,340 people completed the questionnaire. The results of this study, if applied to allAmericans, arequestionable because ofA)a large margin of error.B)selection bias.

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Statistics

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