Question

The level of nitrogen oxides (NOX) in the exhaust of a particular car model varies with mean 0.7 grams per mile and standard deviation 0.16 grams per mile .
(a) What sample size is needed so that the standard deviation of the sampling distribution is 0.01 grams per mile ?

Answer 1

use
\[ \sigma _x = \frac{\sigma}{\sqrt{N}} \]
where \( \sigma _x = 0.01\) and \( \sigma= 0.7\)
solve for N