Final answer:
To express the confidence interval '17.5% ± 6.5%' in interval form, calculate the lower and upper bounds by subtracting and adding 6.5% to the point estimate respectively, resulting in the interval (11%, 24%).
Step-by-step explanation:
To express the confidence interval 17.5% ± 6.5% in interval form, you subtract the margin of error from the lower end and add it to the upper end of the point estimate.
Here, the point estimate is 17.5%, and the margin of error is 6.5%.
The lower end of the interval is calculated by subtracting the margin of error from the point estimate (17.5% - 6.5%), giving us 11%.
The upper end of the interval is found by adding the margin of error to the point estimate (17.5% + 6.5%), which gives us 24%.
Therefore, the confidence interval 17.5% ± 6.5% expressed in interval form is (11%, 24%).