Answer:
The 95% confidence interval for the population proportion of times that the bats would follow the point is (0.505, 0.995).
Step-by-step explanation:
In a sample with a number n of people surveyed with a probability of a success of
, and a confidence interval
, we have the following confidence interval of proportions.

In which
Z is the zscore that has a pvalue of 
For this problem, we have that:
There are 12 bats, and 9 would follow the feeder. This means that
and
.
Find the 95% confidence interval for the population proportion of times that the bats would follow the point.
So
, z is the value of Z that has a pvalue of
, so
.
The lower limit of this interval is:

The upper limit of this interval is:

The 95% confidence interval for the population proportion of times that the bats would follow the point is (0.505, 0.995).