Understanding how to calculate statistical significance.

How do I calculate statistical significance. I conducted an observation in a classroom (1/2 per day (specific time), 5 consecutive days, 12 students in class) to determine the number of times a specific target behaviour occurred (frequency count).

The following week I observed one specific student in the class (1/2 hour per day (specific time), 5 days) to obtain a frequency count of his/her target behavior.

How do I determine if the individual students behavior is one or more standard deviations above the classroom mean for the target behavior.

Classroom: Frequency Count
Day:                    Total Occurrences
1)                                 2
2)                                 3
3)                                 2
4)                                 1
5)                                 3

Total:                            11
Mean:                           2.2
SD:                              .84

Individual Student: Frequency Count
1)                                 2
2)                                 6
3)                                 2
4)                                 2
5)                                 4

Total:                            16
Mean:                           3.2
SD:                              1.79