Asurvey was sent to 1000 randomly selected registered drivers in atlanta asking for the average number of miles driven to and from work each weekday. a 95% confidence interval was computed using the responses obtained fromthe 720 drivers who returned the survey. the margin of error for the interval was reported to be 5 miles. which of the sources of error are accounted for by this margin of error?

a. error due to random sampling
b. error due to nonresponse
c. error due to incorrect data entry

The correct answer is A

Explanation:

Random sampling is the sampling which is from the population in which

a. Electing the sample unit which is grounded on the chance

b. each and every element of the population will be known for the probability of non- zero which is being selected.

This sampling helps in producing or generating the more representative samples through removing the voluntary response and guards or secure against the under coverage bias.

In this case, 1000 random choosen drivers were sent asking for average number of miles driven to work on each weekday. So, 95% uses the responses and margin of error is 5 miles. Therefore, the source of error due to the random sampling is accounted for the margin of error.