Check the three conditions for this t test for one mean.
random: a random sample of
was selected
a manufacturer of a specific make and model of car
claims that the average highway fuel economy is 32
mpg. a skeptical consumer group believes that this may
be an overstatement.
they select a random sample of 10 cars of this make
and model and find that the sample mean number of
miles per gallon is 28, with a standard deviation of 8.3
mpg. the distribution of the sample shows no skewness
or outliers.
10%: 10 < 10% of
. but the
normallarge sample: n =
distribution of the sample
