University of Texas at Arlington SPSS Computation and Interpretation Paper

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Mathematics

The University of Texas at Arlington

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Using the example from Ottomanelli and colleagues (2012), participants were randomized to receive Supported Employment or treatment as usual. A third group, also a treatment as usual group, consisted of a non-randomized observational group of participants. A simulated subset was selected for this example so that the computations would be small and manageable. The independent variable in this example is treatment group (Supported Employment, Treatment as Usual- Randomized, and Treatment as Usual-Observational/Not Randomized), and the dependent variable was the number of hours worked post-treatment. Supported employment refers to a type of specialized interdisciplinary vocational rehabilitation designed to help people with disabilities obtain and maintain community-based competitive employment in their chosen occupation (Bond, 2004).

These data are presented in HW7.sav. The null hypothesis is: “There is no difference between the treatment groups in post-treatment number of hours worked among veterans with spinal cord injuries.”

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Questions to be answered in word doc -

Open in SPSS. Use the dataset to answer the following questions.

  1. Do the data meet criteria for homogeneity of variance? Provide a rationale for your answer.
  2. What is the F value, and the numerator and denominator degrees of freedom?
  3. Compute the ANOVA using SPSS and paste the SPSS table containing the F into your homework.
  4. Is the F significant at a=0.05? Specify how you arrived at your answer.
  5. What is the exact likelihood of obtaining our F value at least as extreme or as close to the one that was actually observed, assuming that the null hypothesis is true?
  6. Write your interpretation of the results, as you would in an APA-formatted journal.
  7. Is there a difference in your final interpretation when comparing the results of the LSD post-hoc test versus Tukey HSD test? Provide a rationale for your answer.
  8. If the researcher decided to combine the two Treatment as Usual groups to represent a overall “Control” group, then there would be two groups to compare: Supported Employment versus Control. What would be the appropriate statistic to address the difference in hours worked between the two groups? Provide a rationale for your answer.



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Attached.

Running head: SPSS COMPUTATION AND INTERPRETATION

SPSS Computation and Interpretation
Student’s Name
Professor’s Name
Course Title
Date

SPSS COMPUTATION AND INTERPRETATION

2

1. Do the data meet criteria for homogeneity of variance? Provide a rationale for your
answer.
Test of Homogeneity of Variances
Hours Worked Per Week
Levene
df1
df2
Sig.
Statistic
.840
2
12
.455
Since the P value (0.455) is greater than 0.05, the data meets the criteria for homogeneity of
variance. As such, a one way ANOVA can be conducted on the data.
2. What is the F value, and the numerator and denominator degrees of freedom?
ANOVA
Hours Worked Per Week
Sum of
Squares
Between
457.200
Groups
Within Groups
445.200
Total
902.400

df

Mean
Square
2

228.600

12
14

37.100

F

6.162

Sig.

.014

The F value is 6.162
Degrees of freedom: Nu...

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