Simplify the expression. (1-cot(x))^2/cot(x)=
1 answer:
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Answer:
Option d.
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 margin of error is:
79 percent of adults age 18 years and older in the United States use the Internet.
This means that
98% confidence level
So , z is the value of Z that has a pvalue of
, so
.
Which of the following should be used to find the sample size (n) needed?
We have to find n for which
So the equation is:
Option d.