If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Main content
Current time:0:00Total duration:3:21

Video transcript

Lucia wants to test whether playing violent video games makes people more violent he asks his friends whether they play violent video games and whether they have been in a fight in the last month he recorded the results in the table shown below fill in the table to show the fraction of each group of students who have been in a fight then decide whether there is an association between violent video games and getting in a fight amongst Lucio's friends so let's see what they're doing here so students who play video games fractions who have been in a fight fraction who haven't students who don't play violent video games fraction who have been in a fight fraction who haven't so let's answer the first part of this students who play violent video games so let's look at those students so the students who play violent video games that looks like Ellen plays violent video games let make sure let me just focus on the data that we care about so Ellen so let's look at all the all the people who play violent video games so let's see this column is about in video games so we have a yes here actually have both of these right over here and then we have down here and then that's all of them there's one two three four five people who play violent video games now what fraction of them have been in a fight well it looks like one out of the five have been in a fight the rest of them have not been in a fight so we could say 1/5 let's just write that down so 1/5 have been in a fight 1/5 have been in a fight fraction who haven't 4/5 so that's all these other knows they play violent video games but they haven't been in a fight 1 2 3 4 4/5 so students who don't play violent video games well that's everyone else and let's see how many data points that is that is 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 so there's a total of 15 students and how many of them have been in a fight so let's see we have 1 and then let's see 1 & 2 & 3 so 3 out of the 15 have been enough fight so 3 out of 15 is the same thing as 1 out of 5 those are equivalent fractions and then the fraction who haven't well that's just going to be everyone else that's going to be that's going to be 12 out of 15 or 4 out of 5 4 out of 5 so based on Lucio's data based on Lucia's data and this wasn't a huge sample size obviously he only found five kids who were playing violent video games and one of them had gotten into a fight so we're not this isn't a super rigorous study but at least based on his data for trying to decide whether there's an association between violent games and getting into a fight amongst Lucille's friends it doesn't seem like there is it seems like relatively whether or not whether or not they play violent video games or not 1/5 of them have been in a fight in the last month so it really doesn't see any seem any difference if this number was I don't know 4/5 or 5/5 or you know all of them then I would say hey you know even with Lucio's fairly small sample I would say you know maybe there is some type of a strong association between playing violent video games and fighting but it here you really don't see any difference