Global Warming  In April 2011, a Yale/George Mason poll of 1010 US adults found that 40% of the people responding...

1. Global Warming  In April 2011, a Yale/George Mason poll of 1010 US adults found that 40% of the people responding believed that scientists disagreed about whether global warming exists.  They reported a 95% confidence interval of 37% to 43%.  

1. What was the study’s margin of error?

2. If the researchers  wanted to be 98% confident, would their confidence interval be wider or narrower?

3. If the researcher wanted to reduce the margin of error, would they need to make their level of confidence higher or lower?

If the researchers had polled more people, would the interval’s margin of error have been larger or smaller?