표 2 / Table 2 보통발화와 명료발화에 따른 켑스트럼 스펙트럼 측정치 비교 / Cepstral & spectral parameter comparisons between casual speech and clear speech

Variables		N	Minimum	Maximum	Mean	SD	t-value	df	p-value
CPP	Casual	15	3.54	6.16	4.68	.85	-4.123	14	.001^***
CPP	Clear	15	4.48	7.70	5.66	.81	-4.123	14	.001^***
CPP SD	Casual	15	2.14	4.03	3.43	.48	-1.540	14	.146
CPP SD	Clear	15	3.05	4.26	3.63	.41	-1.540	14	.146
L/H ratio	Casual	15	32.23	45.77	39.20	4.41	2.062	14	.058
L/H ratio	Clear	15	28.38	46.07	37.81	5.71	2.062	14	.058
L/H ratio SD	Casual	15	9.09	14.36	11.44	1.42	3.946	14	.001^**
L/H ratio SD	Clear	15	7.91	13.17	10.52	1.45	3.946	14	.001^**
CPP F0	Casual	15	184.25	251.68	215.75	20.83	-0.340	14	.739
CPP F0	Clear	15	179.08	252.46	218.72	22.20	-0.340	14	.739
CPP F0 SD	Casual	15	30.24	92.60	61.48	20.51	3.786	14	.002^**
CPP F0 SD	Clear	15	30.97	93.17	50.34	17.39	3.786	14	.002^**

^* p<.05, ^** p<.01, ^*** p<.001
CPP, cepstral peak prominence, L/H ratio, low/high spectral ratio