Enter the ordered pair that is the solution to the system of equations graphed below.
1 answer:
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Answer:
A sample size of 752 is needed.
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 z-score that has a p-value of .
The margin of error is of:
90% confidence level
So , z is the value of Z that has a p-value of
, so
.
If the candidate wants a 3% margin of error at a 90% confidence level, what size of sample is needed?
We have no estimate of the proportion, so we use .
The sample size is n for which M = 0.03. So
Rounding up:
A sample size of 752 is needed.