A simple random sample of 49 8th graders at a large suburban middle school indicated that 82% of them are involved with some type of after school activity. Find the margin of error associated with a 99% confidence interval that estimates the proportion of them that are involved in an after school activity.
a) 0.328
b) 0.141
c) 0.191
d) 0.055
e) 0.128
f) None of the above