RANK OBSERVED EXPECTED (O-E)^2/E SUM

r<=29 1501 211.4 7866.036 7866.036
r=30 15333 5134.0 20260.844 28126.880
r=31 23166 23103.0 0.172 28127.051
r=32 0 11551.5 11551.524 39678.575

chi-square = 39678.575 with df = 3; p-value = 0.000