Answer:
Option A
Explanation:
95% confidence interval is obtained using the following formula
COnfidence interval lower bound = mean - critical value * sigma/sq rt n
and upper bound = mean + critical value*sigma/sq rt n
Thus margin of error = critical value*sigma/rt n
varies indirectly as n provided others are remaining the same.
Hence lower sample indicates higher margin of error
Out of 4 options given we find that I option has maximum margin of error as 21%
Hence option A is most likely coming from a small sample