# Solved – How to calculate a 95% confidence interval from time data

confidence intervalstatistical significance

I have a few (e.g. 10) observations of travel times for a route.

A commuter needs to arrive to his destination before t0 (given).

I want to say: The commuter should depart before t0 - x to arrive to his destination at t0 with probability 95%.

Can I do this just by calculating the sample mean (m) and standard deviation (s) and say that

x = m + 2*s


(the 2 is an approximation of the 2 sigma)

? Thanks.