Keyword Analysis & Research: what is sampling error and non sampling error

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
what is sampling error and non sampling error	0.61	0.2	4501	60	45
what	1.58	1	2849	51	4
is	1.69	0.6	6553	31	2
sampling	0.83	0.7	5165	23	8
error	1.4	0.3	3288	99	5
and	1.69	0.4	1375	27	3
non	1.83	0.6	8274	31	3
sampling	0.43	0.6	6547	46	8
error	0.5	1	6430	59	5

Keyword	CPC	PCC	Volume	Score
what is sampling error and non sampling error	1.05	0.5	502	10
sampling error and non sampling error	1.98	1	9950	3
non sampling error vs sampling error	0.2	0.4	9016	95
sampling error dan non sampling error	0.74	0.7	1758	31
define sampling error and non sampling error	0.6	0.1	5151	56
sampling error vs non sampling error	1.06	0.2	4119	40