The population of the first group is a group of people who spend time using social media more than the average time of using social media in a day. It can be calculated that how the sample spending their time to use social media in each day by multiplying the frequency of using social media each day by average time measured in minutes to gain the results that in a day how much each sample on the average spend time using social media. The sample mean of the population is 2 hours 56 minutes a day.
Then, it can be calculated to the time spending social media, the researcher find the average time of all sample, and then divide the samples into two groups by using the mean time spending to be categorized them.