With the popularity of mobile devices, mobile phones and tablet computers (PAD) have gradually penetrated into people's lives. Many people have also changed from being inseparable from TVs to being inseparable from mobile phones and PADs. Some people believe that more use of computers It will reduce the time people have a TV. After all, time is limited, but surveys show that the increase in "time spent on computers" has not reduced the time spent watching TV. In order to verify the accuracy of the above findings, which of the following is the most important consideration. ['Whether people spend less time watching TV among people who do n’t use or rarely use computers.', 'Except for this part of the population who participated in the survey, are many other people saying that they often watch TV.', 'Among those who participated in the survey, did the type of TV programs they watch change with the use of computer time.', 'The so-called "computer-use time" of the respondent includes the time of using the computer at work.']