3. Two-Way Tables
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We want to find relative frequencies by row. To do so, we will start by completing the given table.
TV | Internet | Total | |
---|---|---|---|
7th grade | 13; | 49; | |
8th grade | 20; | 68; | |
Total |
TV | Internet | Total | |
---|---|---|---|
7th grade | 13; | 49; | 62 |
8th grade | 20; | 68; | 88 |
Total | 33 | 117 |
TV | Internet | Total | |
---|---|---|---|
7th grade | 13; | 49; | 62 |
8th grade | 20; | 68; | 88 |
Total | 33 | 117 | 150 |
To find the relative frequencies by row, we calculate the ratios of each value and the total in that row. We will round the results to the nearest hundredth.
TV | Internet | Total | |
---|---|---|---|
7th grade | 13; 6213≈0.21 | 49; 6249≈0.79 | 62; 6262=1.00 |
8th grade | 20; 8820≈0.23 | 68; 8868≈0.77 | 88; 8888=1.00 |
Total | 33 | 117 | 150 |
Looking at the relative frequencies, we can say that many more 7th and 8th grade students are getting their news from the internet rather than from TV.