Over the course of 87 days, about 200 million gallons of crude oil spilled into the Gulf of Mexico. If the oil spilled at a cons
1 answer:
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Answer:
1.165.
Step-by-step explanation:
We have that to find our level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Ztable as such z has a pvalue of .
So it is z with a pvalue of , so
Now, find the margin of error M as such
In which is the standard deviation of the population and n is the size of the sample.
In this problem, we have that:
. So
So the correct answer is:
1.165.