sampling calculate a 93% confidence interval for the true mean SAR for cell phones certified for use in the US. As previously, assume that the population standard deviation is o = 0.337. Phone Model SAR Phone Model SAR Blackberry Pearl 8120 HTC Evo Design 4G HTC Freestyle LG Ally 1.48 Nokia E71x 1.53 0.8 Nokia N75 0.68 1.15 Nokia N79 1.4 Sagem Puma Samsung Fascinate Samsung Infuse 4G Samsung Nexus S Samsung Replenish 1.36 1.24 LG Fathom 0.77 0.57 LG Optimus Vu Motorola Cliq XT 0.462 0.2 1.36 0.51 Motorola Droid Pro 1.39 0.3 Motorola Droid Razr M 1.3 Sony W518a Walkman 0.73 Nokia 7705 Twist 0.7 ZTE C79 0.869 Solution A

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8.3 The table below shows a different random sampling of 20 cell phone models. Use this data to
calculate a 93% confidence interval for the true mean SAR for cell phones certified for use in the US. As
previously, assume that the population standard deviation is o = 0.337.
Phone Model
SAR
Phone Model
SAR
Blackberry Pearl 8120
HTC Evo Design 4G
1.48
Nokia E71x
1.53
0.8
Nokia N75
0.68
HTC Freestyle
LG Ally
1.15
Nokia N79
1.4
Sagem Puma
Samsung Fascinate
Samsung Infuse 4G
Samsung Nexus S
Samsung Replenish
Sony W518a Walkman
ZTE C79
1.36
1.24
LG Fathom
0.77
0.57
LG Optimus Vu
0.462
0.2
Motorola Cliq XT
1.36
0.51
Motorola Droid Pro
1.39
0.3
Motorola Droid Razr M
1.3
0.73
Nokia 7705 Twist
0.7
0.869
Solution A
Solution B
Interpretation
Transcribed Image Text:8.3 The table below shows a different random sampling of 20 cell phone models. Use this data to calculate a 93% confidence interval for the true mean SAR for cell phones certified for use in the US. As previously, assume that the population standard deviation is o = 0.337. Phone Model SAR Phone Model SAR Blackberry Pearl 8120 HTC Evo Design 4G 1.48 Nokia E71x 1.53 0.8 Nokia N75 0.68 HTC Freestyle LG Ally 1.15 Nokia N79 1.4 Sagem Puma Samsung Fascinate Samsung Infuse 4G Samsung Nexus S Samsung Replenish Sony W518a Walkman ZTE C79 1.36 1.24 LG Fathom 0.77 0.57 LG Optimus Vu 0.462 0.2 Motorola Cliq XT 1.36 0.51 Motorola Droid Pro 1.39 0.3 Motorola Droid Razr M 1.3 0.73 Nokia 7705 Twist 0.7 0.869 Solution A Solution B Interpretation
Expert Solution
Step 1

CI = \bar{x} \pm z \frac{s}{\sqrt{n}}

To calculate, use
invNorm(CI + (1-CI)/2)

To find the z-score for the central 93%, remember that 7% is in the tails, 3.5% in the upper tail and 3.5% in the lower tail. So
invNorm(.965)=1.812 is our z

 

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