1. Examine variables X1 – X8 for any violations of the normality
assumption. Pick a variable that you feel violates the assumption. Run at least
three transformations on that variable, and then make a decision as to which
transformed version leads to the best improvement. If none of the transformed
versions lead to any improvement, then continue to use the original variable.
Write up the procedure you followed for that one variable (ignore the others
that you tested) in the form that you would write it up were if it were part of
a research report. For all of the remaining questions, use the transformed
variable (assuming that you decide that the transformed variable is an
improvement on the original; otherwise, stick with the original).
OR
2. Test the homogeneity of variance assumption on variables X1
to X8, with variable X10 as the grouping variable/factor. Pick one variable
that you feel violates the assumption and run the appropriate power
transformation on that variable. Write up the procedure you followed for that one variable (ignore the others
that you tested) in the form that you would write it up if it were part of a
research report. For all of the remaining questions, use the transformed
variable (assuming that you decide that the transformed variable is an
improvement on the original; otherwise, stick with the original)
3. Carry out a contingency table analysis using c2 to answer the question of whether there is a significant relationship
between age and group. In other words, are older and younger participants
equally represented across the three groups? Show a bar chart of this
relationship and present the descriptive statistics in a properly formatted APA
table. Make sure that after running the c2 analysis you use
standardised residuals to help interpret the result.
4. Are there age differences for (1) the scores on the
experimental adaptive behaviour scale (X8), and (2) the modified Stanford-Binet
IQ test (X5)? Write up the results in APA style, including properly formatted
APA-style graphs of the means and an APA style table of the descriptive results
(you can provide the results for both variables in the one table or in separate
tables). Two separate analyses and two graphs are required for this question,
and at least one table.
5. Show a correlation matrix of the eight dependent variables,
with significance levels. Present the matrix as a properly formatted APA-style
table, then pick two significant correlations from the matrix and write up
these results in APA style.
6. Is there a significant difference between scores on the
simple learning test (X6) and scores on the test of verbal ability (X7), which have
been standardised and therefore are measured along the same scale; they are
directly comparable. Pick an appropriate significance test to answer this
question, and write the results up in APA style, along with a properly
formatted APA bar chart and a table of the descriptive results.
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