Recent results suggest that children with ADHD tend to watch more TV than childr
ID: 2959109 • Letter: R
Question
Recent results suggest that children with ADHD tend to watch more TV than children who are not diagnosed with the disorder. To examine this relationship, a researcher obtains a random sample of n=36 children, 8 to 12 years old, who have been diagnosed with ADHD. Each child is asked to keep a journal recording how much time each day is spent watching TV. The average daily time for the sample M=4.9 hours. It is known that the average time for the general population of 8 to 12-year-old child us u=4.1 hours with o=1.8.a. Are the data sufficient to conclude that children with ADHD watch significantly
more TV than children without the disorder? Used two-tailed test with a=.05.
b. If the researcher had used a sample of n=9 children and obtained the same
sample mean, would the results be sufficient to reject Ho?
c. Compute Cohen's d for this study. (Notice that the value you obtain does not
depend on whether the sample size was n=36 or n=9.)
Explanation / Answer
random sample of n = 36 children, 8 to 12 years old, who have been diagnosed with ADHD. Each child is asked to keep a journal recording how much time each day is spent watching TV. The average daily time for the sample is M = 4.9 hours. It is known that the average time for the general population of 8 to 12-year-old children is
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