A soda bottling plant fills cans labeled to contain 12 ounces of soda. The filling machine…

A soda bottling plant fills cans labeled to contain 12 ounces of
soda. The filling machine varies and does not fill each can with
exactly 12 ounces. To determine if the filling machine needs
adjustment, each day the quality control manager measures the
amount of soda per can for a random sample of 50 cans. Experience
shows that its filling machines have a known population standard
deviation of 0.35 ounces.
In today’s sample of 50 cans of soda, the sample average amount
of soda per can is 12.1 ounces.
Construct and interpret a 90% confidence interval estimate for
the true population average amount of soda contained in all cans
filled today at this bottling plant. Use a 90% confidence
level.
X =
population parameter: m =
random variable =