Statistics Solutions

(All Steps) The stimulant Ritalin has been shown to increase attention span and improve academic performance in children with ADHD. To demonstrate effectiveness

Question: The stimulant Ritalin has been shown to increase attention span and improve academic performance in children with ADHD. To demonstrate effectiveness of the drug a researcher selects a sample of n=25 children diagnosed with the disorder and measures each child`s attention span before and after taking the drug. The data show an average increase of attention span of M D =6.8 minutes with a standard deviation of s=5.5.

  1. Is this result sufficient to conclude that Ritalin has a significant effect on attention span? Use a two tailed test with α=.01.
  2. Compare r 2 and estimate Cohen`s d to measure the effect size of the drug.

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