Take Home Quiz
Due Tuesday April 11
at the start of class
For each problem: Identify the type of test, write out the null and alternative hypothesis, and include a statement along
with your decision.
Marine engines, particularly those of
large container or cargo ships, are rated to burn fuel based on its viscosity.
The most common fuel is known as 6 oil and should have a kinematic viscosity of 15 mm/s
C. Jonny ran
a set of 12 samples of 6 oil from a shore tank and calculated the
viscosity as 14.3 mm/s
with a standard
Can Jonny conclude at 99% confidence that the shore tank of 6 oil
the distribution is approximately normal.
Gasoline retailers are mandated by the EPA to
have completely transitioned to selling summer
grade gasoline by
every year. To be considered summer
grade, the Reid Vapor Pressure (RVP)
of the gasoline
can be no
more than 9
is under suspicion of selling winter grade gas past the
0 samples of gas from various Enmark
locations and the mean RVP is found to be
If the standard deviation of the test method is known to be
psi, can the investigator conclude that they are
g the wrong grade?
The rumor among gasoline chemists is that
n oil/gas is very low quality and
boats are rejected
more often than others.
single barge of gasoline can be worth
10 million dollar
(assume no more than 15% of the time)
Shamgan was bored one day while waiting for the cargo boat
to arrive and decided to check the old laboratory records.
In the last
years a total of
originated from Russia
. Of those
their chemical testing
and were rejected
At a significance level of
95%, can Shamgan safely conclude that
Russian gas is more likely to
be rejected than