The following data was collected in a survey of 8th graders

case-control studies
September 27, 2019
The gestation period for human births
September 27, 2019

Question

The following data was collected in a survey of 8th graders and summarize their cell phone status. /> No Cell Phone Conventional Cell Phone user Smart Phone user TotalBoys 55 65 35 155Girls 31 78 27 136Total 86 143 62 291
What proportion of the 8th graders have conventional cell phones?

 
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