Hello, I need help with this assignment. Please answer the questions after you r

Question

Hello,

I need help with this assignment. Please answer the questions after you read the case study.

Also, there's a link to access the online book. Let me know if you have any question.

18. (AT#1) What is the independent variable of this experiment? How many levels does it have? (relevant section)

19. (AT#2) What is the dependent variable? On what scale (nominal, ordinal, interval, ratio) was it measured? (relevant section)

http://onlinestatbook.com/version_1.html

This study investigated the cognitive effects of stimulant medication in children with mental retardation and Attention-Deficit/Hyperactivity Disorder. This case study shows the data for the Delay of Gratification (DOG) task. Children were given various dosages of a drug, methylphenidate (MPH) and then completed this task as part of a larger battery of tests. The order of doses was counterbalanced so that each dose appeared equally often in each position. For example, six children received the lowest dose first, six received it second, etc. The children were on each dose one week before testing.

This task, adapted from the preschool delay task of the Gordon Diagnostic System (Gordon, 1983), measures the ability to suppress or delay impulsive behavioral responses. Children were told that a star would appear on the computer screen if they waited “long enough” to press a response key. If a child responded sooner in less than four seconds after their previous response, they did not earn a star, and the 4-second counter restarted. The DOG differentiates children with and without ADHD of normal intelligence (e.g., Mayes et al., 2001), and is sensitive to MPH treatment in these children (Hall & Kataria, 1992).

Explanation / Answer

Answer for Question no. 18

Independent variable is the variables which can be altered/changed by the scientist to perform the certain experiment .In this case study , dosages of the drug methylphenidate (MPH) is the independent variable of the experiment .

Levels of this experiment is two ( because here they have compared these two groups)

1. The group of the six children received lowest dose first.

2. The group of another six children received the lowest dose after first group.

Answer for question no- 19

Dependent variable is the one which can be change according to independent variable's values.In this experiment , dependent varible is delay of gratification (DOG) values to see the impulsive behavioral responses. It was measured at interval scale .

Related Questions

Navigate

• Browse (All)
• Browse H
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.