ore:0 of 1 pt 2.27 Astudy of 420,001 ?phone users foundthat 137oftemde eloped ca

Question

ore:0 of 1 pt 2.27 Astudy of 420,001 ?phone users foundthat 137oftemde eloped cancer ef the brain or nervous system Prir toth th,ofo,phine use heaedad carcer wasfound to be 00341%for tese not usig cel phones Congble parts (a) and (b) ?.Use te sample data toconstruct a9%coridence iterval estimate ofthe percentage ofce, phone ubers who dev lap cancer of-brainornerms sysa. epo Round to theee decimal places as needed) 21 25 n 29 on 33 tion 37 36 Eter your answer in the edt fields and then click Check Answer cear A

Explanation / Answer

Ans:

Given that

sample proportion=137/420001=0.000326

z value for 90% confidence interval is 1.645

90% confidence interval for p

=0.000326+/-1.645*sqrt(0.000326*(1-0.000326)/420001)

=0.000326+/-0.000046

=(0.000280, 0.000372)

or

=(0.028%,0.037%)

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