Poll Toplines and Methodology

November 2018 Poll

Grinnell College National Poll November 2018 Toplines with Methodology and Crosstabs

The Grinnell College National Poll, conducted November 24-27 for Grinnell College by Selzer & Co. of
Des Moines, IA, is based on telephone interviews with 1,000 U.S. adults ages 18 or older, including
828 likely voters in the 2020 general election and 769 self-identified voters in the 2018 midterm
election.

Interviewers with Quantel Research contacted households with randomly selected landline and cell phone
numbers supplied by Survey Sampling International. Interviews were administered in English. Responses
were adjusted by age, race, and educational attainment to reflect the general population based on
recent census data.

Percentages based on the full probability sample of 1,000 respondents may have a maximum margin of
error of plus or minus 3.1 percentage points. This means that if this survey were repeated using the same
questions and the same methodology, 19 times out of 20, the findings would not vary from the true
population value by more than plus or minus 3.1 percentage points. Results based on smaller samples of
respondents—such as by gender or age—have a larger margin of error. Results based on likely voters in
the 2020 general election have a maximum margin of error of plus or minus 3.4 percentage points, and
results based on the self-identified voters in the 2018 midterm election have a maximum margin of error
of plus or minus 3.5 percentage points.

 

August/September 2018 Poll

Grinnell College National Poll Sept 2018 Toplines with Methodology

The Grinnell College National Poll, conducted August 29-September 2 for Grinnell College by Selzer & Co. of Des Moines, IA, is based on telephone interviews with 1,002 U.S. adults ages 18 or older, including 779 likely voters in the 2018 general election.

Interviewers with Quantel Research contacted households with randomly selected landline and cell phone numbers supplied by Survey Sampling International. Interviews were administered in English. Responses were adjusted by age, sex, race, and educational attainment to reflect the general population based on recent census data.

Percentages based on the full probability sample of 1,002 respondents may have a maximum margin of error of plus or minus 3.1 percentage points. This means that if this survey were repeated using the same questions and the same methodology, 19 times out of 20, the findings would not vary from the true population value by more than plus or minus 3.1 percentage points. Results based on smaller samples of respondents—such as by gender or age—have a larger margin of error. Results based on likely voters in the 2018 general election have a maximum margin of error of plus or minus 3.5 percentage points.

 

 

For media inquiries, contact Andy Garman at agarman@thinkwixted.com.

For additional technical information about this study, contact Michelle Yeoman at myeoman@selzerco.com.

We use cookies to enable essential services and functionality on our site, enhance your user experience, provide a better service through personalized content, collect data on how visitors interact with our site, and enable advertising services.

To accept the use of cookies and continue on to the site, click "I Agree." For more information about our use of cookies and to opt-out of cookies at any time, please refer to our website Privacy Policy.