Question
In: Statistics and Probability
The time that people require to react to a stimulus usually has a right-skewed distribution, as...
The time that people require to react to a stimulus usually has
a right-skewed distribution, as lack of attention or tiredness
causes some lengthy reaction times. Reaction times for children
with attention deficit hyperactivity disorder (ADHD) are more
skewed, as their condition causes more frequent lack of attention.
In one study, children with ADHD were asked to press the spacebar
on a computer keyboard when any letter other than X
appeared on the screen. With 2 seconds between letters, the mean
reaction time was 449 milliseconds (ms) and the standard deviation
was 81 ms. Take these values to be the population μ and
σ for ADHD children. (Round your standard deviations to
two decimal places.)
What are the mean and standard deviation of the mean reaction time
x for a randomly chosen group of 15 ADHD children?
| mean | ms |
| standard deviation | ms |
What are the mean and standard deviation of the mean reaction time
x for a randomly chosen group of 150 ADHD children?
| mean | ms |
| standard deviation | ms |
Solutions
Expert Solution
Solution :
mean = 
= 449
standard deviation = 
= 81
1) n = 15
Mean = 
=
= 449
Standard deviation = 
=
/ 
n =81 /
15 = 20.9141
2)n = 150
Mean =
=
= 449
Standard deviation =
=
/
n =81 /
150 = 6.6136
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