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 ADHD and measures 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. Is this result sufficient to conclude that Ritalin significantly improves attention span? Use a one-tailed test at .05. Compute the 80% confidence interval for the mean chance in attention span for the population.
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 ADHD and measures 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.
Is this result sufficient to conclude that Ritalin significantly improves attention span? Use a one-tailed test at .05.
Compute the 80% confidence interval for the
Given:
The drug effectiveness is analyzed in which the researcher having sample of n = 20. The children got diagnosed based on the ADHD. It includes the attention span based on MD=4.8 minutes based on the variance with s2 = 125. The value gets based on one-tailed test at .05.
The confidence interval which includes 80% in which the chance of the mean get attention span based of the population is need to be determined as follows,
It includes n samples with n=20. It includes child attention span that include before and after the drug being taken. It includes the average attention span with MD = 4.8 minutes with a variance of s2 = 125
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