sample of voters were polled to determine the likelyhood of measure 324 passing. The poll determined that 40 % of voters were in favor of the measure with a margin of error of 4.5 %. Find the confidence interval . Use () in your notation .

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Example 8.11 For a class project, a political science student at a large university wants to estimate the percent of students who are registered voters. He surveys 500 students and finds that 300 are registered voters. Compute a 90% confidence interval for the true percent of students who are registered voters, and interpret the confidence interval.

A poll of 2338 U.S. adults found that 71% regularly used Facebook as a news source. Find the margin of error and confidence interval for the percentage of U.S. adults who regularly use Facebook as a news source, at the 90% level of confidence. Round all answers to 2 decimal places. Margin of Error (as a percentage): Confidence Interval: % to % Find the margin of error and confidence interval for the percentage of U.S. adults who regularly use Facebook as a news source, at the 95% level of confidence. Round all answers to 2 decimal places. Margin of Error (as a percentage): Confidence Interval: % to %

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A poll of 1070 U.S. adults found that 563 U.S. adults, or 52.617% regularly used Facebook as a news source. Find the margin of error and confidence interval for the percentage of U.S. adults who regularly use Facebook as a news source, at the 90% level of confidence. Express all answers as percentages rounded to 2 decimal places. Do not write the percent sign. Margin of Error (as a percentage): Confidence Interval: Margin of Error (as a percentage): Confidence Interval: Now find the margin of error and confidence interval for the percentage of U.S. adults who regularly use Facebook as a news source, at the 95% level of confidence. Margin of Error (as a percentage): Confidence Interval: % to O increases O stays roughly the same O decreases % to Finally, find the margin of error and confidence interval for the percentage of U.S. adults who regularly use Facebook as a news source, at the 99% level of confidence. and the precision of our estimate O decreases O increases O stays roughly the…

Use the confidence interval to find the estimated margin of error. Then find the sample mean.   A store manager reports a confidence interval of (41.6,81.0) when estimating the mean price​ (in dollars) for the population of textbooks.       The estimated margin of error is enter your response here. ​(Type an integer or a​ decimal.)

The last poll of 144 voters in Iowa shows that 19% of voters will vote for him in the Iowa Presidential Caucus.  What is the 99% confidence interval of his support level in Iowa?

From a sample of 500 Pepperdine students, 205 said they commuted to school. Find the 95% confidence interval using 2 decimal places for the proportion of Pepperdine students who commute. If you use a calculator, indicate the function used and the parameters you entered for the function.

Insurance companies are interested in knowing the population percent of drivers who always buckle up before riding in a car. They randomly survey 406 drivers and find that 304 claim to always buckle up. Construct a 82% confidence interval for the population proportion that claim to always buckle up. Use interval notation, for example, [1,5]