A researcher wanted to check whether the percentage of Canadian adults with obesity has decreased in 2009 compared to 2005. He used Health Canada data. He randomly selected 75 Canadian adults from 2005 data and found 12 of them are obese; In a random sample of 120 Canadian adults from 2009 data, he found 17 of them are obese. He wants to develop a 96% confidence interval for the change is obese percentage. Let population1 be 2005 data and population2 be 2009 data. Write down the critical value.

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Q: f n=450 and X = 360, construct a 99% confidence interval.

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Q: Find a 95% confidence interval for the proportion of renters.

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Q: If n=590 and p=0.93, construct a 90% confidence interval.

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