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 the company. The margin of error was given as \pm 3 percentage points. What important feature of the poll was omitted?

Choose the correct answer.
The confidence level
The confidence interval
The sample size
The point estimate

Step 1 ：The question is asking about a missing feature in the poll results. The poll results provided the point estimate (26%) and the margin of error (±3 percentage points). The sample size is also given (1910 professionals).

Step 2 ：What is not provided is the confidence level or the confidence interval. The confidence level tells us how sure we can be that the results of the poll are accurate within the margin of error.

Step 3 ：The confidence interval is a range of values, derived from the statistics of the observed data, that is likely to contain an unknown population parameter. However, since the margin of error is given, we can infer the confidence interval.

Step 4 ：Therefore, the missing feature is the confidence level.

Step 5 ：\(\boxed{\text{The confidence level}}\)