A study of 420097 cell phone users found that 134 of them developed cancer of the brain or nervous system. Prior to this study of cell phone​ use, the rate of such cancer was found to be 0.0427% for those not using cell phones. Complete parts​ (a) and​ (b) A. Use the sample data to construct a 95​% confidence interval estimate of the percentage of cell phone users who develop cancer of the brain or nervous system.

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Asked Oct 25, 2019
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A study of 420097 cell phone users found that 134 of them developed cancer of the brain or nervous system. Prior to this study of cell phone​ use, the rate of such cancer was found to be 0.0427% for those not using cell phones. Complete parts​ (a) and​ (b)

 

A. Use the sample data to construct a 95​% confidence interval estimate of the percentage of cell phone users who develop cancer of the brain or nervous system.

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Expert Answer

Step 1

The provided data is,

x 134
n= 420097
C.L.= 95%
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x 134 n= 420097 C.L.= 95%

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Step 2

Therefore, the sample proportion is,

x
n
134
420097
=0.0003
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x n 134 420097 =0.0003

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Step 3

The level of confidence is provided as 95% or 0.95. Therefore, the level of sign...

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