FINAL
ASSIGNMENT INSTRUCTIONS:
For this
homework assignment, you are to select 3 problems to complete.
No two may
be of the same type: (a) T test with equal or unequal variance, (b)
Paired t test, (c) CHITEST, (d) ANOVA, and (e) Regression. One of your choices must be a regression.
You are to
give the Ho and Ha, complete the appropriate test, give the conclusion both in
terms of whether to reject the null or not and in terms of how the research
question would be answered and mark the cell that points to the conclusion. In each case, assume a 95% confidence level.
When done,
delete the extra worksheets and submit.
MOTORS
Four
different models of motors are tested for their lifespan under a heavy
load. At the end of 100 hours the test
is ended. The time to failure (or 100 if
no failure) is recorded below. The
testers want to determine if there is any difference in the models’
lifetimes. If there is a difference, the
testers want to know where.
MATH
TEST
A
mathematics class has taken two tests and the scores for each student are given
below. The teacher believes that the
first test was easier than the second and wants to test that theory. (Actual data from a real course.)
TAXES
AND WORK
Some
candidates want to raise taxes and some want to lower them. Higher taxes mean you take home less. Do workers work more hours to
compensate? Use the data below from a
variety of countries to determine whether a nation’s tax rate is associated
with its work week. What work week would
be expected in a country with a 50% tax rate?
How much of the length of the work week explained by taxes? How much change in work week is associated
with a 1% increase in the tax rate?
Explain why the direction of the relationship does or does not meet your
expectation.
(Source: Energy Information Administration,
http://www.eia.doe.gov/listserv_signup.html)
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