Bill draws a regular octagon with the perimeter of 32 units.He picks a vertex of the octagon and draws two line segments through
the interior of the octagon on each different opposite vertex.His line segments divide the octagon into three quadrilaterals.what does the shape look like ?
1 answer:
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Answer:
A sample of 767 is needed.
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 given by:
For this problem, we have that:
14 defectives out of 160, so
95% confidence level
So , z is the value of Z that has a pvalue of
, so
.
How many units would have to be sampled to be 95% confident that you can estimate the fraction of defective parts within 2% of the percentage?
We would need a sample of n.
n is fround when . So
Rounding up
A sample of 767 is needed.