You may need to use the appropriate appendix table or technology to answer this question. The average monthly electric bill of a random sample of 256 residents of a city is $112 with a standard deviation of $39. (a) Construct a 90% confidence interval for the mean monthly electric bills of all residents (in dollars). (Round your answers to the nearest cent.) to $ (b) Construct a 95% confidence interval for the mean monthly electric bills of all residents (in dollars). (Round your answers to the nearest cent.) to $ $

MATLAB: An Introduction with Applications
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ISBN:9781119256830
Author:Amos Gilat
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Chapter1: Starting With Matlab
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You may need to use the appropriate appendix table or technology to answer this question.
The average monthly electric bill of a random sample of 256 residents of a city is $112 with a standard deviation of $39.
(a) Construct a 90% confidence interval for the mean monthly electric bills of all residents (in dollars). (Round your answers to the nearest cent.)
to $
82°F
Sunny
esc
$
-6.9
(b) Construct a 95% confidence interval for the mean monthly electric bills of all residents (in dollars). (Round your answers to the nearest cent.)
to $
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Transcribed Image Text:K →1 You may need to use the appropriate appendix table or technology to answer this question. The average monthly electric bill of a random sample of 256 residents of a city is $112 with a standard deviation of $39. (a) Construct a 90% confidence interval for the mean monthly electric bills of all residents (in dollars). (Round your answers to the nearest cent.) to $ 82°F Sunny esc $ -6.9 (b) Construct a 95% confidence interval for the mean monthly electric bills of all residents (in dollars). (Round your answers to the nearest cent.) to $ Need Help? f1 1 $ ? Q f2 J J 8 Read It 2 f3 W # 3 JL E f4 $ 4 f5 R 10 olo 5 f6 4- T 6 0 17 + & Y f8 7 IAA D hp fg 00 DII f10 f11 112 insert 2
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