If we take 78 as the 100%, what's 11 of it?
well
solve for "x"
Answer:
a. [.243, .311]
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 .
For this problem, we have that:
In a randomly selected group of 650 automobile deaths, 180 were alcohol related. This means that
95% confidence level
So , z is the value of Z that has a pvalue of , so .
The lower limit of this interval is:
The upper limit of this interval is:
So the correct answer is:
a. [.243, .311]
I'm guessing the repeating part is 89 at the end, so that
Then
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An arguably quicker way without using geometric series:
The answer is 39 and I know because I took the test and got it right