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i                    pi hat i
0 (never)            3/2(0.308-1/18)
1 (14 or younger)    3/2(0.108-1/18)
2 (15)               3/2(0.092-1/18)
3 (16)               3/2(0.169-1/18)
4 (17)               3/2(0.115-1/18)
5 (18 or older)      3/2(0.208-1/18)