0. The stimulant Ritalin has been shown to increase atten- tion span and improve academic performance in chil- dren with ADHD (Evans et al., 2001). To demonstrate the effectiveness of the drug, a researcher selects a sample of n 5 20 children diagnosed with the disorder and measures each child’s attention span before and af- ter taking the drug. The data show an average increase of attention span of MD 5 4.8 minutes with a variance of s2 5 125 for the sample of difference scores. Is this result sufficient to conclude that Ritalin significantly improves attention span? Use a one- tailed test with a 5 .05. Compute the 80% confidence interval for the mean change in attention span for the population.
10. The stimulant Ritalin has been shown to increase atten- tion span and improve academic performance in chil- dren with ADHD (Evans et al., 2001). To demonstrate the effectiveness of the drug, a researcher selects a sample of n 5 20 children diagnosed with the disorder and measures each child’s attention span before and af- ter taking the drug. The data show an average increase of attention span of MD 5 4.8 minutes with a variance of s2 5 125 for the sample of difference scores.
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Is this result sufficient to conclude that Ritalin significantly improves attention span? Use a one- tailed test with a 5 .05.
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Compute the 80% confidence interval for the mean change in attention span for the population.
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