A random sample of 200 students was surveyed to determine participants' number of siblings. The results are
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Question:
A random sample of 200 students was surveyed to determine participants' number of siblings. The results are shown in the table.
| Grade Level | No. of Siblings | ||||
|---|---|---|---|---|---|
| 0 | 1 | 2 | 3 | 4 | |
| Freshman | 9 | 15 | 16 | 6 | 4 |
| Sophomore | 18 | 14 | 8 | 7 | 3 |
| Junior | 5 | 16 | 16 | 12 | 1 |
| Senior | 13 | 4 | 18 | 13 | 2 |
How many degrees of freedom exist for a 2 test on these data? (2 points)
| Four |
| Five |
| Nine |
| 12 |
| 20 |
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