Observations Interval	Linear			Polynomial
Observations Interval	$y_{i}$	${\hat{y}}_{i}$	$e_{i}$	$y_{i}$	${\hat{y}}_{i}$	$e_{i}$
32.5 - 37.5	35.91	43.23	−7.32	35.91	36.56	−0.65
37.5 - 42.5	40.43	46.11	−5.68	40.43	43.02	−2.59
42.5 - 47.5	45.00	45.75	−0.74	45.00	45.22	−0.22
47.5 - 52.5	50.13	50.09	0.04	50.41	50.33	0.08
52.5 - 57.5	55.00	54.17	0.83	50.00	54.56	0.44