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Unformatted text preview: We can say with 95% confidence that the amount by which a proportion obtained from a sample will differ from the population proportion will not exceed n 1 Example Suppose you take a sample of 1600 adults and 800 enjoy amusement park rides. 1. What is the sample proportion that enjoy amusement park rides? 2. What is the margin of error? 3. Give a confidence statement for the proportion of all adults who enjoy amusement park rides. Answers 1. % 50 5 . 1600 800 = = 2. % 5 . 2 025 . 40 1 1600 1 1 = = = = n 3. We are 95% confident that the population proportion of adults that enjoy amusement park rides is between 47.5% and 52.5% There are other factors besides sample size that affect the margin of error. However, these factors can always be dealt with by a large enough sample size. The factors follow and will be discussed in detail later in the course. • How confident do we want to be in our conclusions • How much variability is in our data...
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 Fall '10
 Bradley,W
 Statistics, amusement park rides

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