One year, the mean age of an inmate on death row was 38.2 years. A sociologist...
One year, the mean age of an inmate on death row was
38.2
years. A sociologist wondered whether the mean age of a death-row inmate has changed since then. She randomly selects
32
death-row inmates and finds that their mean age is
36.6,
with a standard deviation of
8.9.
Construct a 95% confidence interval about the mean age. What does the interval imply?
LOADING...
Click the icon to view the table of critical t-values.
Choose the correct hypotheses.
Upper H 0:
▼
p
sigma
x overbar
mu
▼
less than
not equals
greater than
equals
nothing
Upper H 1:
▼
mu
x overbar
p
sigma
▼
less than
equals
greater than
not equals
nothing
(Type integers or decimals. Do not round.)
Construct a 95% confidence interval about the mean age.
The lower bound is
nothing.
The upper bound is
nothing.
(Round to two decimal places as needed.)
What does the interval imply?
A.
Since the mean age from the earlier year
is not
contained in the interval, there
is not
sufficient evidence to conclude that the mean age had changed.
B.
Since the mean age from the earlier year
is
contained in the interval, there
is
sufficient evidence to conclude that the mean age had changed.
C.
Since the mean age from the earlier year
is
contained in the interval, there
is not
sufficient evidence to conclude that the mean age had changed.
D.
Since the mean age from the earlier year
is not
contained in the interval, there
is
sufficient evidence to conclude that the mean age had changed.
Click to select your answer(s).
Homework Answers
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