sample of n = 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 Mp = 4.8 minutes with a variance of s' = 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 a = .05. b. Compute the 80% confidence interval for the mean
sample of n = 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 Mp = 4.8 minutes with a variance of s' = 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 a = .05. b. Compute the 80% confidence interval for the mean
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Chapter1: Starting With Matlab
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Transcribed Image Text: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 = 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 Mp
of s' = 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 a = .05.
b. Compute the 80% confidence interval for the mean
change in attention span for the population.
= 4.8 minutes with a variance
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Step 1
Given that,
Sample size
Mean increase of attention span
Standard deviation of difference scores
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