(c) Find the standard error. Round to four decimal places. The standard error is X
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 alt="The lifetime of a certain type of battery is known to be normally distributed with standard deviation o = 22 hours. A sample of 50 batteries had a mean
lifetime of 120.1 hours. It is desired to construct a 95% confidence interval for the mean lifetime for this type of battery.
Part 1 of 6
(a) What is the point estimate?
The point estimate is 120.1
#
Part 2 of 6
(b) Find the critical value.
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14 101
$
4
81
fs P
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5
6
=
17
&
7
4+
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Transcribed Image Text:The lifetime of a certain type of battery is known to be normally distributed with standard deviation o = 22 hours. A sample of 50 batteries had a mean
lifetime of 120.1 hours. It is desired to construct a 95% confidence interval for the mean lifetime for this type of battery.
Part 1 of 6
(a) What is the point estimate?
The point estimate is 120.1
#
Part 2 of 6
(b) Find the critical value.
Skip Part
esc
!
Type here to search
f
1
Recheck
?
a
12
2
Try one last time
#
3
14 101
$
4
81
fs P
%
5
6
=
17
&
7
4+
Ⓒ2023 McGraw Hill LLC. All Rights Reserved.
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00
8
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(
9
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110
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d
 alt="tab
Part 3 of 6
(c) Find the standard error. Round to four decimal places.
#
The standard error is
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Transcribed Image Text:tab
Part 3 of 6
(c) Find the standard error. Round to four decimal places.
#
The standard error is
Skip Part
esc
Type here to search
in ?
7
Recheck
Q
a
2
W
#
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*
X
3
E
$
4
S
Al
%
R
5
T
6
17
4-
&
7
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