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18 Example 2 Confidence Interval TI 84 Plus deviation of 9 84 hours Assume this...

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18 Example 2 Confidence Interval TI 84 Plus deviation of 9 84 hours Assume this is a simple random sample from the population internet in an average week The sample mean was 8 20 hours with a sample standard A sample of 123 people aged 18 22 reported the number of hours they spent on Construct a 98 confidence interval for u the population mean number of hours per week spent on the internet in that age group Degrees of Freedom 100 or 0 025 1 984 95 x tan n In 0 01 2 364 98 Area in the Right Tail 0 005 0 0025 2 871 99 5 Confidence Level Formula o Confident Interval of population mean x m X m 2 626 99

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