An Efficient Approximation Method for Calculating Confidence Level of Negative Survey

Table 1

The confidence level as (, ).

		Confidence interval	Confidence level:
		,
0.05	0.9	(0.85, 0.95)	0.8675	0.994	0.9998	1
0.1	0.8	(0.75, 0.85)	0.7354	0.9701	0.9973	0.9991
0.15	0.7	(0.65, 0.75)	0.639	0.9299	0.9887	0.9952
0.2	0.6	(0.55, 0.65)	0.5711	0.8851	0.9735	0.9867
0.25	0.5	(0.45, 0.55)	0.5208	0.8422	0.9537	0.9739
0.3	0.4	(0.35, 0.45)	0.4816	0.803	0.9316	0.9582
0.35	0.3	(0.25, 0.35)	0.4508	0.7679	0.9086	0.9408
0.4	0.2	(0.15, 0.25)	0.4352	0.7364	0.8859	0.9226
0.45	0.1	(0.05, 0.15)	0.4851	0.7257	0.8659	0.9049