A recent poll of 80 randomly selected Californians showed that 38% ( = 0.38) believe they are doing all that they can to conserve water.
The state government would like to know, within a 99% confidence level, the margin of error for this poll. (99% confidence level z*-score of 2.58)
Remember, the margin of error, E, can be determined using the formula E = z*.
To the nearest whole percent, the margin of error for the poll is %.