Originally Posted by

**trojsi** In a tutorial I am given the standard deviation of bolts(over a long period of time), the mean diameter of a 200 bolts sample and that in one day the machine produces 6000 bolts.

stdev = 0.013cm

sample= 200 bolts

mean dia = 0.455cm

6000 bolts/day

then I am asked to determine ex the 96% confidence limits and the 99% confidence limits for an estimate of the mean diameter of all bolts produced in one day.

If someone can give a brief explanation or some links on the matter, it would be really appreciated.

Brandon