For this Assignment, you are working at a firm that conducts
independent testing for heavy industry. Recently, an automobile
manufacturer has been in the news for complaints about the highway
gas mileage of their latest model minivan. You receive a contract
from a consumer action group to test and write a report on the
company’s claim that its minivans get 28 miles per gallon on the
highway. The car company agrees to allow you to select randomly 35
low-mileage fleet minivans to test their highway mileage. Your test
results gave you the following data:
29.7 24.5
27.1 29.8
29.2 27.0
27.8 24.1 29.3
25.9 26.2
24.5 32.8
26.8 27.8
24.0 23.6 29.2
26.5 27.7
27.1 23.7
24.1 27.2
25.9 26.7
27.8
27.3 27.6
22.8 25.3
26.6 26.4
27.1 26.1
List the null and alternative hypotheses for the two-tail test
for the mean. Calculate the observed value of the test statistic
and the associated p-value.
Is the observed test statistic in the critical region? Is the
p-value higher or lower than your alpha?
List the null and alternative hypotheses for the one-tail test
of the mean. Calculate the observed value of the test statistic and
the associated p-value.
Is the observed test statistic in the critical region? Will the
p-value be higher or lower than your alpha?