Juanita bought one CD for $7.99 and one DVD for $8.99. The sales tax on these items was 7%. She also bought lunch for $4.25, inc
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Quadrant are counted anti clockwise
Quadrant are counted anti clockwise
Using the z-distribution, considering the standard 95% confidence level, the margin of error is of 0.0486 = 4.86%.
<h3>What is a confidence interval of proportions?</h3>A confidence interval of proportions is given by:
The margin of error is:
In which:
is the sample proportion.
- z is the critical value.
- n is the sample size.
In this problem, we have a 95% confidence level, hence, z is the value of Z that has a p-value of
, so the critical value is z = 1.96.
The sample size and the estimate are given by:
Hence the margin of error is:
M = 0.0486 = 4.86%.
More can be learned about the z-distribution at brainly.com/question/25890103
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