Homework for Chapter 12
1. The average flight time using a certain flight path between two cities is 5.25 hours. A new flight path between
these two cities is being considered. It is hoped that this new path will reduce flight time. A sample of 15 flights
using the new flight path is taken. The average time of these sample flights was 4.95 hours and the standard
deviation of the sample flights was 0.4 hours. Set up and test the hypothesis that the new path reduces flying time at
the .05 level.
3. Test
verses ,
given that a sample of 25 pieces of data had a mean of 4.1
and the data is from a normal distribution with a known standard deviation of .30. Perform this test at the .05 level.
5. A random sample of 8 pieces of data was
taken from a normal population. The sample had an average of 82.7 and a standard
deviation of 4.4. Perform a .01 level test to determine if the population mean is
different than 80.
7. A sample of 10 pieces of data is collected and
we wish to perform the level test vs. . The
population standard deviation is known to be .25. The sample mean is used
to calculate the data z value of .
vs.
Our Test Statistic is:
Reject Ho.
The data supports the
claim
Our Test Statistic is:
Fail to Reject Ho.
The data does not
support the claim
vs.
Our Test Statistic is:
What are Ho and Ha?
This is a t-test.
What is the value of our test
statistic?
This is a z-test.
What is the value of our test
statistic?
What type of HT is this?
(Z, t, chi-square)
What type of HT is this?
(Z, t, chi-square)
Our properly labeled picture!
Our properly labeled picture!
Conclusion in words.
Conclusion in words.
Conclusion?
Conclusion?
What are Ho and Ha?
This is a t-test.
What is the value of our test
statistic?
What type of HT is this?
(Z, t, chi-square)
Our properly labeled picture!
Fail to Reject Ho.
The data does not
support the claim
Conclusion in words.
Conclusion?
