How to do surveys

Identify possible sources for error for each of the parameters measured and how you can avoid or minimize the error. (i.e. Is there any bias?)
In every survey there´s always the mistakes of peoplein answering in an incorrect form the survey asked, so it can´t be a representative result, so in other to correct those types of mistakes or not that specific information we can have a wider range ofthe people asked to answer those survey´s, people of both genders, different ages, and different cultural backgrounds in order to assure a more accurate answer.
Furthermore to ensure the people thatis answering that all the information is confidential and it only will be used for the purpose of these investigation and nothing more, so people can answer it in a more trustful way so they put realand relevant information, in a more honest way.
Also you can always compare your results with other investigations made by other people to see the similarities in the final results, and help yourselfwith trustful information like academic reports, and stadistics of newspapers, etc.

Some external backup information to compare results:
In other cases, injured plaintiffs have also been found tohave contributed to the accident because they were using a cell phone while driving.
Examples of careless driving caused by cell phone use include:
-driving with only one hand on the steeringwheel
-taking eyes off the road to reach for a cell phone or dial a number
-failing to keep a proper lookout and to pay attention to surrounding dangers because of distractions caused by the cell phone(this includes being distracted by a passenger's cell phone use), and
- being distracted by a conversation on a cell phone (according to some studies, being involved in any kind of conversation --particularly an emotionally charged one -- is enough to distract a driver and cause him or her to drive carelessly).
Insurance companies are paying close attention to the link between cell phone use...