Research suggests that Attention Deficit Hyperactivity Disorder (ADHD) is frequently accompanied by motor coordination problems. To test this hypothesis, you take a sample of 180 children who have been diagnosed with ADHD and a second sample of 180 typically developing children of the same age. You then assess each child’s motor coordination using the Developmental Coordination Disorder Questionnaire (DCD-Q), a well validated parent report measure developed to assist in the identification of motor difficulties. This questionnaire asks parents to compare their child’s motor performance in everyday motor activities to that of his/her peers. Scores on the DCD-Q are normally distributed and range from 0-100 (M = 50 SD = 10). Higher scores on the DCD-Q indicate higher levels of motor coordination.
You then run an independent samples t-test to test whether the mean DCD-Q score of the ADHD group is different from the mean DCD-Q score of the typically developing group. You obtain the following output from the analysis:
The below questions relate to the above SPSS output.
The following questions do not require you to use the above SPSS output.
The research teams of these respective studies send you their preliminary analyses, with both studies conducting an independent samples t-test to compare the mean stress level of those who received the new Stress therapy to those who were not receiving any therapy in their respective studies. You receive the following SPSS output:
Study A (Young Adults)
Study B (Older Adults)
Based on your understanding of the steps involved in conducting and interpreting an independent samples t-test (as discussed during the Blackboard Collaborate), would you argue that the Stress therapy in question is effective? If no, why not? If yes, would you be more, less or equally likely to use this new therapy with Young or Older adults? Justify your responses using relevant statistical information. (2 marks).