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28.01.2020 •
Mathematics
Icollect a random sample of size n from a population and compute a 95% confidence interval for the proportion i observe from the population. what could i do to produce a new confidence interval with a smaller width, smaller margin of error, based on these same data?
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Ответ:
You should increase the size of your random sample, that is, increase the value of n.
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 .
The margin of error is:
This means that as we increase the sample size(n), the margin of error decreases, as does the width of the confidence interval.
What could I do to produce a new confidence interval with a smaller width, smaller margin of error, based on these same data?
You should increase the size of your random sample, that is, increase the value of n.
Ответ:
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