Question
In: Statistics and Probability
3.3 What is the effect of concussion on brain size? Researchers measured the brain sizes (hippocampal...
3.3 What is the effect of concussion on brain size? Researchers
measured the brain sizes (hippocampal volume in
microliters) of 25 football players with a history of medically
diagnosed concussion and 25 football player who
did not have any history of concussion.
The data are summarised below.
| Group | Mean | Std. Deviation |
| concussion | 5819 | 597.2 |
| Non-concussion | 6377 | 709.8 |
a) Are the mean brain sizes for footballers from the two
concussion groups significantly different?
Carry out a hypothesis test. Use a significance level of 5% and use
df = n1+n2-2.
b) Create a 95% confidence interval for the mean difference in
brain size, and interpret the interval.
c) Does the confidence interval confirm your answer to a)?
Explain.
Solutions
orchestra answered 2 years agoRelated Solutions
What is the effect of concussions on the brain? Researchers measured the brain sizes (hippocampal volume...
What is the effect of concussions on the brain? Researchers
measured the brain sizes (hippocampal volume in microliters) of
2525 collegiate football players with a history of
clinician‑diagnosed concussions and 2525 collegiate football
players without a history of concussions. The table shows the
summary statistics.
Group
Group Size
Mean
Standard Deviation
Concussion
25
5784
609.3
Nonconcussion
25
6489
815.4
(a) Is there evidence of a difference in mean brain size between
football players with a history of concussions and those...
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 19 adolescents with alcohol use disorders to determine
whether the hippocampal volumes in the alcohol adolescents were
less than the normal volume of 9.02 cm3. An analysis of the sample
data revealed that the hippocampal volume is approximately normal
with x=8.06 cm3 and s=0.7 cm3.
Conduct the appropriate test...
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 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
analysis of the sample data revealed that the hippocampal volume is
approximately normal with x̅ = 8.09 cm3 and s = 0.8 0.8...
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 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
analysis of the sample data revealed that the hippocampal volume is
approximately normal with no outliers and x overbarequals8.11 cm
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....
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 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
analysis of the sample data revealed that the hippocampal volume is
approximately normal with x overbarequals8.07 cm cubed and
sequals0.7 cm cubed....
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 24 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. 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=...
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
23
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 no outliers and
x overbarxequals=8.12
cm cubedcm3
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
1818
adolescents with alcohol use disorders to determine whether the
hippocampal volumes in the alcoholic adolescents were less than the
normal volume of
9.029.02
cm cubedcm3.
An analysis of the sample data revealed that the hippocampal
volume is approximately normal with
x overbarxequals=8.078.07
cm cubedcm3
and
sequals=0.80.8
cm cubedcm3....
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 21 adolescents with
PLEASE ONLY HOW TO SOLVE USING TI83
PLEASE!!!!!
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 analysis of the sample data revealed
that the hippocampal volume is approximately normal with...
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