Final answer:
The margin of error for the confidence interval (0.304, 0.440) is 0.068 and the sample mean is 0.372.
Step-by-step explanation:
Given the confidence interval (0.304, 0.440), we can use it to find both the sample mean and the margin of error. The confidence interval is calculated as the sample mean plus or minus the margin of error. To find the margin of error (EBM), we calculate half of the difference between the upper and lower bounds of the confidence interval.
MARGIN OF ERROR = (Upper Bound - Lower Bound) / 2 = (0.440 - 0.304) / 2 = 0.068.
To find the sample mean, we take the average of the upper and lower bounds: SAMPLE MEAN = (Lower Bound + Upper Bound) / 2 = (0.304 + 0.440) / 2 = 0.372.
Therefore, the margin of error is 0.068, and the sample mean is 0.372.