Question
In: Statistics and Probability
In a study examining the effect of alcohol on reaction time, Liguori and Robinson (2001) found...
In a study examining the effect of alcohol on reaction
time, Liguori and Robinson (2001) found that even
moderate alcohol consumption significantly slowed
response time to an emergency situation in a driving
simulation. In a similar study, researchers measured
reaction time 30 minutes after participants consumed
one 6-ounce glass of wine. Again, they used a standardized
driving simulation task for which the regular population averages the
u = 400 msec. The distribution of reaction times is approximately normal with o = 40.
Assume that the researcher obtained a sample mean of M = 422 for the n = 25 participants in the study.
a. Are the data sufficient to conclude that the alcohol has a significant effect on reaction time?
Use a two-tailed test with a = .01.
b. Do the data provide evidence that the alcohol significantly increased (slowed) reaction time?
Use a one-tailed test with a = .05.
c. Compute Cohen's d to estimate the size of the effect.
Solutions
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orchestra answered 2 years agoRelated Solutions
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on the hippocampal region, the portion of the brain responsible
for long-term memory storage, in adolescents. The researchers
randomly selected 13 adolescents with alcohol use disorders to
determine whether the hippocampal volumes in the alcoholic
adolescents were less than the normal volume of 9.02 cm3. An
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on the hippocampal region, the portion of the brain responsible
for long-term memory storage, in adolescents. The researchers
randomly selected 10 adolescents with alcohol use disorders to
determine whether the hippocampal volumes in the alcoholic
adolescents were less than the normal volume of 9.02 cm cubed. An
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cubed and...
In a study, researchers wanted to measure the effect of alcohol on the hippocampal region, the...
In a study, researchers wanted to measure the effect of alcohol
on the hippocampal region, the portion of the brain responsible
for long-term memory storage, in adolescents. The researchers
randomly selected
12
adolescents with alcohol use disorders to determine whether the
hippocampal volumes in the alcoholic adolescents were less than the
normal volume of
9.02
cm cubedcm3.
An analysis of the sample data revealed that the hippocampal
volume is approximately normal with
x overbarxequals=8.05
cm cubedcm3
and
sequals=0.7
cm cubedcm3....
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for long-term memory storage, in adolescents. The researchers
randomly selected 11 adolescents with alcohol use disorders to
determine whether the hippocampal volumes in the alcoholic
adolescents were less than the normal volume of 9.02 cm cubed. An
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sequals0.7 cm cubed....
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whether the hippocampal volumes in the alcoholic adolescents were
less than the normal volume of 9.02 cm. An analysis of the sample
data revealed that the hippocampal volume is approximately normal
with no outliers and x bar=8.12 cm and s=...
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