a study of 420053 cell phone users found that 131 of them developed cancer of th

Question

a study of 420053 cell phone users found that 131 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 0.0446% for those not using cell phones a study of 420053 cell phone users found that 131 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 0.0446% for those not using cell phones a study of 420053 cell phone users found that 131 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 0.0446% for those not using cell phones

Explanation / Answer

Ans:

sample proportion=131/420053=0.000312

z value for 90% confidence interval =1.645

Margin of error=sqrt(0.000312*(1-0.000312)/420053)=0.000045

90% confdence interval for p

=0.000312+/-0.000045

=(0.000267, 0.000357)

or (0.0267% , 0.0357%

As,confidence interval does not include 0.0446,it means that population proportion of people who using cell phones developing brain cancer is different from those not using cell phone.

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