Module 10b Activity

Confidence interval with t-value [Refer to Module 10a slides for an example]

We want to find out if college students trust a presidential candidate (in this case Mitt Romney). We randomly select 29 college students from a national registry (assuming there was such a thing) and ask them to rate how trustworthy they find Mitt Romney on a scale of 0 to 7 with 0 being completely untrustworthy and 7 being completely trustworthy. The sample of 29 students results in an average of 3.94 points. We will also assume a sample standard deviation (sigma) of 2 points.

Using Table C from the text or the one pasted below, determine what the "t" value should be for a 95% Confidence Interval. 

Then use the formula below to calculate a 95% confidence interval for college students level of trust of Mitt Romney. Show your work and/or describe the process you used to find the answer.