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

r<=29 1489 211.4 7720.325 7720.325
r=30 15346 5134.0 20312.527 28032.852
r=31 23165 23103.0 0.166 28033.018
r=32 0 11551.5 11551.524 39584.542

chi-square = 39584.542 with df = 3; p-value = 0.000