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A survey of undergraduate college students at a small university was recently done by an administrator in charge of residential life services. A random sample of 300 students was selected from each class level (freshman, sophomore, junior, senior). Each student was asked to complete and return a short questionnaire on the quality of campus residence (high quality, medium quality, low quality). Some students returned the questionnaire, and some didn't. Of those who did return the questionnaire, the results are summarised in the table below:
Class | High | Medium | Low | Total |
Freshman (1st year) | 65 | 25 | 20 | 110 |
Sophomore (2nd year) | 55 | 30 | 45 | 130 |
Junior (3rd year) | 60 | 40 | 70 | 170 |
Senior (4th year) | 30 | 60 | 70 | 160 |
Total | 210 | 155 | 205 | 570 |
We might conclude that:
(Instructions: select ALL correct answers)