![]() The table below presents his findings.īased on these 100 people, he concludes that the average yearly income for all 8,077 inhabitants is probably between $25,630 and $32,052. A scientist wants to know their average yearly income. Confidence Intervals - ExampleĮl Hierro is the smallest Canary island and has 8,077 inhabitants of 18 years or over. So basically, a confidence interval tells us how much our sample correlation is likely to differ from the population correlation we're after.
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