<PRE><B>Question 308806</B>
A race car driver tested his car for the number of seconds required to travel from 0 to 60 mph. 
In 20 tests he obtained an average of 4.85 seconds with a standard deviation of 1.47 seconds. Construct a 95% confidence interval for the 0 to 60 time. 
---------------
sample mean = 4.85 seconds
---
standard Error = E = 1.96*1.47/sqrt(20) = 0.6443
--------------------
95% CI: 4.85-0.6443 &lt; u &lt; 4.85+0.6443
=====================================
Cheers,
Stan H. </PRE>