Question

In 2002, the mean age of an inmate on death row was 40.7 years,
according to data obtained from

the U.S. Department of Justice. A sociologist wants to test the
claim that 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 37.9, with a

standard deviation of 9.6. Test the sociologist’s claim using a 1%
level of significance.

Answer #1

Here claim is that mean has changed from 40.7

So hypothesis here is vs

As population standard deviation is not known so we will use t distribution

Test statistics is

So P value is TDIST(1.65,31,2)=0.1090> alpha=0.01

Hence we fail to reject the null hypothesis

So we do not have sufficient evidence to support the claim that mean is different from 40.7

In 2002, the mean age of an inmate on death row was 40.7 years,
according to data obtained from
the U.S. Department of Justice. A sociologist wants to test the
claim that 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 37.9, with a
standard deviation of 9.6. Test the sociologist’s claim using a 1%
level of significance.

In 2002, the mean age of an inmate on death row was 40.7 years,
according to data obtained from the U.S. Department of Justice. A
sociologist wondered whether the mean age of a death-row inmate has
changed since then. She randomly selects 34 death-row inmates and
finds that their mean age is 38.5, with a standard deviation of
10.2. Does this data indicate that the mean age of
death-row inmates has changed significantly since 2002. Use the α =
0.05 level...

One year, the mean age of an inmate on death row was 40.7
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 38.9 , with a standard
deviation of 8.5 . Construct a 95% confidence interval about the
mean age. What does the interval imply?

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40.440.4?,
with a standard deviation of
9.29.2.
Construct a? 95% confidence interval about the mean age. What
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a? death-row inmate has changed since then. She randomly selects 40
?death-row inmates and finds that their mean age is 42.4?, with a
standard deviation of 8.6. Construct a 95?% confidence interval
about the mean age of death row inmates. What does the interval?
imply? Construct a 95?% confidence interval about the mean age. ?(
,...

One year, the mean age of an inmate on death row was 40.8
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 40.3 with a standard
deviation of 9.9 Construct a 95% confidence interval about the
mean age. What does the interval imply?
Construct the correct hypthesis
A) H0 mu ___ ____
B) H1 mu ___ _____
C) Construct a...

One year, the mean age of an inmate on death row was 39.9
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 38.3,with a standard
deviation of 8.1. Construct a 95% confidence interval about the
mean age. What does the interval imply?
A) Choose the correct hypotheses.
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The lower bound...

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years. A sociologist wondered whether the mean age of a
death-row inmate has changed since then. She randomly selects
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death-row inmates and finds that their mean age is
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with a standard deviation of
8.18.1.
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...

One year, the mean age of an inmate on death row was 40.5
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 39.5, with a standard
deviation of 8.6. 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...

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