STAT 1040 Midterm: mid2spring2009
Document Summary
The test is out of 100 points and you have 50 minutes, so budget your time accordingly: (16 points) a box contains 2 red marbles and 8 blue marbles. For parts (a) through (d), assume we draw 2 marbles with replacement from the box. 1: in the 2008 presidential election, 63% of utah voters voted for mccain. True or false? (b) a large sample can be less accurate than a small sample. True or false? (c) the law of averages says that as we toss a coin more and more times, the chance of getting exactly 50% heads will get larger and larger. True or false? (d) if a 95% con dence interval goes from 2. 8 to 3. 3, we know that about 95% of the tickets in the box will be between 2. 8 and 3. 3. True or false? (e) for simple random samples, if we want twice the accuracy, we should sample twice as many people.