Concept explainers
In Exercises
In the survey in Exercise 11, 150 of the 600 Americans surveyed responded, "It is not important." For each of the following levels of confidence, find the sample proportion and the margin of error associated with the poll.
a. an 85% level of confidence.
b. a 98% level of confidence.
11. A survey asked, “How important is it to you to buy products that are made in America?” of the 600 Americans surveyed, 450 responded, “It is important.” For each of the following levels of confidence, find the sample proportion and the margin of error associated with the poll.
a. a 90% level of confidence
b. a 98% level of confidence
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