Table 6.

Confidence interval DN.

	Small	Medium	Large
Data
Sample size:	5	5	8
Sample average:	3,536.71	7,658.24	13,747.13
Population variance:	1,611,045.74	2,283,910.70	17,225,203.65
Confidence level:	0.99	0.99	0.99
Results
Alfa (α):	0.01	0.01	0.01
Z α/2 =	2.58	2.58	2.58
Z α =	2.33	2.33	2.33
	μ interval, σ known	μ interval, σ known	μ interval, σ known
	2,074.58 <  μ  < 4,998.84	5,917.35 <  μ  < 9,399.13	9,967.45 <  μ  < 17,526.80
	1,402.24  4,658.66	6,045.07  9,831.42	10,080.30 22,828.24