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 70 Canadian adults from 2005 data and found 11 of them are obese; In a random sample of 110 Canadian adults from 2009 data, he found 15 of them are obese. He wants to develop a 94% confidence interval for the change is obese percentage. Let population1 be 2005 data and population2 be 2009 data. Write down the critical value.