The stimulant Ritalin has been shown to increase attention span and improve academic performance in children with ADHD (Evans et al., 2001). To demonstrate the effectiveness of the drug, a researcher selects a sample of n – 20 children diagnosed with the disorder and measure each child’s attention span before and after taking the drug. The data show an average increase of attention span of MD = 4.8 minutes with a variance of s2 – 125 for the sample of difference scores.
a. Is this result sufficient to conclude that Ritalin significantly improves attention span? Use a one tailed test with α = .05.
b. Compute the 80% confidence interval for the
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Chapter 11 Solutions
EBK APLIA FOR GRAVETTER/WALLNAU/FORZANO
- Glencoe Algebra 1, Student Edition, 9780079039897...AlgebraISBN:9780079039897Author:CarterPublisher:McGraw HillBig Ideas Math A Bridge To Success Algebra 1: Stu...AlgebraISBN:9781680331141Author:HOUGHTON MIFFLIN HARCOURTPublisher:Houghton Mifflin Harcourt