Data Analysis
Return to the the Freshman_Wt data set ( The Data was
attached )with the invalid data removed and the added variable, the weight
difference. Recall that the data set
contains the weight of freshmen both before and after their first semester at a
leading state university. The freshmen
lived
in either an on-campus dorm (O), or a private off-campus
dorm managed by DormsRUs (D), who claims their students have a healthier
lifestyle.
Prepare a 700-1,050 word written report that addresses the
following:
Sort the data into groups that would allow you to more
easily evaluate your two research questions. ( Research Questions:
1. Do the on-campus students gain more than the DormsRUs
ones?
2. Do the men gain
more wt. than the women at this school?
Formulate each research question into a null and an alternative
hypothesis. These should be stated
mathematically and in writing.
Construct the same statistics and graphics that used in your
earlier paper on selected groups of the data so they could help you reach
tentative conclusions concerning your research questions. In conducting this analysis, follow the
example of the industrial wheel problem in Examples 2.2
and 2.17 of Statistics for Business and Economics. ( You can
use any indusrial wheel problem, if need reference you can ask )
Discuss the center, shape, and spread of the weight
difference as revealed by these graphics.
Reach tentative conclusions to your research questions based
on these statistics and graphics. State
the reasons for your conclusions.
Produce a normal probability plot (called a "Normal
Curve Plot" in MegaStat's Descriptive Statistics menu) for the weight
difference variable. Use this to assess
whether the data are normally distributed based on Section 4.7 of Statistics for Business and Economics.
Perform a mathematical assessment of normality using a
formula involving the IQR and the standard deviation, which is also found in
Section 4.7 of Statistics for Business
and Economics.
Based on comparing sections 6.3 and 6.5 of the text when
would this determination of normality be useful and why?
Compare at least one conclusion with one or more studies of
freshmen's weight by citing journal article(s).
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