Winthrop University: Winthrop Poll - Current Poll Methodology
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Winthrop Poll
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Methodology Statement

April 2022 Winthrop Poll

These results represent the responses of 817 adult residents in South Carolina. Results that use all respondents have a margin of error of +/- 3.4% at the 95% confidence level. Any subset will have a larger margin of error. Margins of error are based on weighted sample size and account for design effects. No design or sampling effects were expected due to sampling methodology.

Phone calls were made primarily during weekday evenings, all day Saturday, and Sunday afternoon and evening. Conducting weekend calls is important to avoid systematically excluding certain populations (such as those who may work 2nd or 3rd shift during the week). The survey used (1) Random Digit Dialing (RDD) for Land Line and (2) Random Wireless phone number sampling. Both RDD and wireless samples are crucial to ensure no adult in the geographical area of interest is systematically excluded from the sample. The Center for Public Opinion & Policy Research often has multiple projects going at the same time. This Winthrop Poll was in the field from April 2 – 24, 2022. There was no calling on Easter, April 17. Efforts were made to only offer questions about on-going (rather than “hot button”) issues that would not be expected to shift dramatically over the time of the survey.

All samples were purchased from Dynata (formerly Survey Sampling International). Data are weighted based on age, sex, and race using Census Bureau data. Phone numbers selected for the survey were re-dialed up to 4 times in an attempt to reach a respondent. Surveys were conducted in English. According to the Centers for Disease Control Wireless Substitution Rates, only 4% of South Carolinians are unreachable by cell phones and are reachable only by land line. 6% of our sample was reached via land line.

Computerized autodialers were not used in order to ensure the survey of wireless phones complied with the Telephone Consumers Protection Act and all FCC rules regarding contacting wireless telephones.

The Winthrop Poll is paid for by Winthrop University.

 

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Last Updated: 7/13/22