Using the example from Ottomanelli and colleagues (2012) study, participants wer
ID: 3201260 • Letter: U
Question
Using the example from Ottomanelli and colleagues (2012) study, participants were randomized to receive Supported Employment or treatment as usual. A third group, also a treatment as usual group, consisted of a nonrandomized 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).
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.”
Please provide answer for the following:
If the researcher decided to combine the two Treatment as Usual groups to represent an 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.
Participant Supported Employment Participant TAU observational Participant TAU Randomized 15 18 12 28 4 17 18 14 16 TAU Treatment as Usual.Explanation / Answer
Result:
Please provide answer for the following:
If the researcher decided to combine the two Treatment as Usual groups to represent an 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.
We want to compare two group means, Supported Employment versus Control.
The two sample t-test ( independent sample t test) used to assess whether the means of two groups are statistically different from each other. Here we are assuming the data come from normal population.
If the data not follows normal distribution we have to use Man Whitney U test, a nonparametric test alternate to two sample t test.
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