Final answer:
To express the confidence interval 57% ± 3.2% in interval form, convert the percentages to decimals, subtract and add the margin of error to the point estimate, resulting in the interval (0.538, 0.602).
Step-by-step explanation:
To express the confidence interval 57% ± 3.2% in interval form, we start by converting the percentages to their decimal equivalents. To do so, we divide each percentage value by 100. Thus, we have 0.57 for 57% and 0.032 for 3.2%. Next, we calculate the lower limit of the interval by subtracting the margin of error from the point estimate: 0.57 - 0.032 = 0.538. Then, we calculate the upper limit by adding the margin of error to the point estimate: 0.57 + 0.032 = 0.602. Therefore, the confidence interval in interval form is (0.538, 0.602).