Who selected the questions? The AJC created the survey, which included several questions we have asked in previous polls.
Whom did we talk to? 1,025 registered voters from across the state, from Jan. 6 to 15. The numbers were randomly drawn from a voter registration list obtained through the sampling vendor L2. The company maintains a database constructed from the state's voter registration lists. Through commercial sources, phone numbers have been added to the individual records (registrants) that make up these lists. 70% of the calls were made to cellphone numbers; 30% to landlines.
What is weighting and how do you do it? Some adjustments are made to the total population of people surveyed to accurately reflect the demographics of the state. This poll was weighted for race, age, sex and education. Adjusting for the education level of respondents is a change made with this poll. The practice is becoming more common and is recommended by the American Association for Polling Opinion and Research (AAPOR).
What is the "margin of error" for the poll, and what exactly does that mean? No matter how carefully a poll is conducted, there will always be some measure of uncertainty when you survey a small portion of a larger population, such as the state of Georgia. The margin of error is the measure of the uncertainty in the sample. The margin of error that we report accounts for these sources of uncertainty. For example, with a margin of error of 4 percentage points, a candidate polling at 50% could have support of anywhere between 46% and 54%, with a 95% level of confidence. That means that if we drew 100 different samples using the same methodology, then no more than 5 times out of 100 should chance variations in the sample cause the results to vary by more than 4 percentage points from the answers that would be obtained if all Georgians were polled.