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