a. Survey more students.
Step-by-step explanation:
In a sample with a number n of people surveyed with a probability of a success of , and a confidence level of
, we have the following confidence interval of proportions.
In which
z is the zscore that has a pvalue of .
The higher the confidene level, the higher the value of z is.
The margin of error is given by:
The smaller the margin of error, the narrower the interval is.
What can they do to make a narrower interval?
As we saw from the equation above, the margin of error decreases as the sample size increases.
So the correct answer is:
a. Survey more students.
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DStep-by-step explanation: