Weaknesses: Some weaknesses of the survey could be non response bias and response error.  We didn't take into account of people who don't have texting on their cell phone plans.  Also we did not take into account individuals not having a cell phone. 

Extrapolation: We could apply this study to most teenagers cell phone usage.  Also we can see from our graphs that females both talk and texts more than males.

Suggestions:  If we were to do the study again we would give our selves more time to collect surveys and give the student the survey directly. This way there would be less of a response bias. We would also eliminate any student who did not own a cell phone.