A 2014 Gallup Poll of 1028 adults found that 216 thought abortion should be illegal in all circumstances, a decrease of 2 percentage points from the record high in 2009. We are 95% confident that between ___% and ___% of all adults thought abortion should be illegal in all circumstances.

21.06

To find the confidence interval for the percentage of adults who thought abortion should be illegal in all circumstances, we can use the sample proportion and the margin of error. The formula for the confidence interval is:

Sample proportion ± (Z * Standard Error)

Where:
- Sample proportion is the proportion of individuals in the sample with a certain characteristic (in this case, the proportion who thought abortion should be illegal in all circumstances). It is calculated by dividing the number of individuals with the characteristic by the total sample size.
- Z is the z-score, which corresponds to the desired level of confidence. For a 95% confidence level, the z-score is approximately 1.96.
- Standard Error is the measure of the variation in the sample proportion.

First, calculate the sample proportion:
Sample Proportion = number of individuals who thought abortion should be illegal in all circumstances / total sample size
Sample Proportion = 216 / 1028 = 0.210

Next, calculate the standard error:
Standard Error = sqrt((Sample Proportion * (1 - Sample Proportion)) / sample size)
Standard Error = sqrt((0.210 * (1 - 0.210)) / 1028) = 0.0157

Now, calculate the margin of error:
Margin of Error = Z * Standard Error
Margin of Error = 1.96 * 0.0157 = 0.0308

Finally, calculate the lower and upper bound of the confidence interval:
Lower Bound = Sample Proportion - Margin of Error
Lower Bound = 0.210 - 0.0308 = 0.1792

Upper Bound = Sample Proportion + Margin of Error
Upper Bound = 0.210 + 0.0308 = 0.2408

Thus, we are 95% confident that between 17.92% and 24.08% of all adults thought abortion should be illegal in all circumstances based on the Gallup Poll data.