A newspaper provided a snapshot illustrating poll results from 1910 professionals who interview job applicants.

A newspaper provided a "snapshot" illustrating poll results from 1910 professionals who interview job applicants. The illustration showed that 26% of them said the biggest interview turnoff is that the applicant did not make an effort to learn about the job or company. The margin of error was give as ±3 percentage points. What important feature of the poll was omitted?