In nursing, we seldom know the true values or percentages of many illnesses or syndromes. For example, if we were asked

[answerhappygod]

In nursing, we seldom know the true values or percentages of
many illnesses or syndromes. For example, if we were asked
how many people contracted a particular strain of flu during a year
then we could give estimates but not the true count. Not
everybody went to the doctor or emergency room. Most probably
did not get a test to determine the particular strain of the
flu. Sometimes we just deal with estimates.
For example, in a survey done in November 2018, 43% of people in
the United States had been vaccinated against the flu with 3.9%
margin of error with 95% confidence ("News Scan for Dec 06, 2018",
2018). This would allow us to create a confidence
interval:
lower bound = 43% - 3.9% = 39.1%
upper bound = 43% + 3.9% = 46.9%
so we are 95% confident that the true percentage of individuals
that got vaccinated is between 39.1% and 46.9%.
Reference
News Scan for Dec 06, 2018. (2018). Retrieved
from http://www.cidrap.umn.edu/news-perspect ... ec-06-2018