In 2011 The U S Department Of Transportation Reported With 95 Confidence Th

With 95% confidence the authors of the report are claiming that the true average length of a motor vehicle trip in the United States is between 

_________ and _________ miles

The level of confidence for this estimate is __________%

Solution

ME = 0.22 miles and X-bar = 9.72 miles.

The 95% CI is X-bar -/+ ME = (9.50, 9.94) miles.

The level of confidence is 95% (This is given as part of the problem)