Exercise on the Z Confidence Interval for the Population Proportion
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Estimate the proportion of all cars that are foreign with 92% confidence. After collecting a random sample of 29 cars you find a sample proportion of 0.66.
Directions: Fill in the blanks and click the button to have your answers graded.
A. Do not round intermediate calculations.
B. Round your answers to two decimal places.
C. You have 30 minutes to complete your work before session timeout. After that your work
will not be graded correctly.
1. Z table value =
2. Margin of Error =
3: You estimate with 92% confidence that the population proportion falls between
the lower value of
and the upper value of
(If you get Question 3 correct, you will be asked an additional question)
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