Question

Greetings! I am hoping someone could please tel me if I'm answering this correctly. I think the IV is weather or not the kids had Ritalin or not. I'm also thinking that the DV is the amount of attention kids exhibited. I am not as sure with C. and D., I think C is within and D. is true. Is there a way to easily distinguish weather something is between or within subjects? Thanks!

Ritalin has been shown to increase attention span and improve academic performance in children diagnosed with ADHD (Evans et al., 2001). To demonstrate the effectiveness of Ritalin, a researcher obtains a sample of 25 children and measures their attention span (the amount of time the child is able to focus on a task) twice: first before taking Ritalin, and second after taking Ritalin. The researcher found that Ritalin increased attention span by an average of 6.8 minutes. a. Independent variable: b. Dependent variable: c. (Circle One): Between subjects Within subjects d. (Circle One): True Experimental Quasi Experimental

Answer 1

Since this is a repeated measures t test or paired t test case,

as Independent Réation taken or not ine. Kids had Riatlin or or not klependent variable !- Attention span of children diagonised with with ADHD el Within subjects

d) True experimental.

The t-test assesses whether the mean scores from two experimental conditions are statistically different from one another. A repeated-measures t-test (also known by other names such as the 'paired samples' or 'related t-test) is what you should use in situations when your design is within participants. In a within participants design, participants contribute data for the dependent variable in ALL of the experimental conditions.

• A true experiment is a type of experimental design and is thought to be the most accurate type of experimental research. • True experiment supports or refutes a hypothesis using statistical analysis. • A true experiment is also thought to be the only experimental design that can establish cause and effect relationships

If there is any understanding problem regarding the sum, please feel free to ask any doubt in comment box. THANKS.