Using the same sample statistics you calculate a 95 tinterva

Using the same sample statistics, you calculate a 95% t-interval for a population mean and a 95% z-interval for a population mean. Which interval has a larger margin of error? A. The two intervals have the same margin of error. B. The t-interval\'s margin of error is larger. C. Which interval has the larger margin or error depends on the degrees of freedom for the z-interval. D. Which interval has the larger margin or error depends on the degrees of freedom for the t-interval. E. The z -interval\'s margin of error is larger. A 2008 Gallup poll found that 47% of adults 18 years old or older in the United States felt that a third political party is needed to represent the American people. In the description of methods, the poll takers said: For results based on the total sample of national adults, one can say with 95% confidence that the maximum margin of sampling error is Plus or minus 3 percentage points. The term 95% confidence means we can be A. 95% confident that between 44% and 50% of the people interviewed think we should have a third party. B. sure that between 44% and 50% of all Americans think we should have a third party. C. 95% confident that between 44% and 50% of all Americans think we should have a third party. D. 95% confident that 47% of all Americans think we should have a third party. E. between 93% and 97% confident that 47% of all Americans think we should have a third party.

Solution

my answer:

1) C

2) B