1. What are generally the 3 most common percentage used when finding confidence interval? 2. z a is called 3. Looking at table A2, we want to find z & corresponding to a = 0.126. 4. Write the formula for the marginal error E for population proportion. 5. Write the steps (procedure) for constructing confidence interval for population proportion. 6. What formula we need to use to calculate the sample size for population proportion If is not known? 7. When calculating sample size n, do we round normally? Do we round down? Do we round up? 8. What are requirements for t distribution (also known as student t distribution)? 9. Given n, degrees of freedom is 10. When finding the confidence interval for population mean: . If o is known we use table. . If o is not known we use table. 11. Is x2 (Chi Squared) distribution symmetric? 12. x2 (Chi Squared) table gives you area ( Choose left or right for the blank)