Jessa works at a potato chip factory and would like to estimate the mean weight in grams of the factory's potato chip bags for quality control purposes. She'll sample n
nn bags of chips to build a
90
%
90%90, percent confidence interval for the mean with a margin of error of no more than
15
g
15 g15, start text, space, g, end text. Preliminary data suggests that
σ
=
60
g
σ=60 gsigma, equals, 60, start text, space, g, end text is a reasonable estimate for the standard deviation of these weights.