Keyword Analysis & Research: what is the notation for sample statistic

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
what is the notation for sample statistic	0.39	0.5	3270	6	41
what	0.76	0.7	2996	98	4
is	0.02	1	2169	71	2
the	1.72	0.8	7361	12	3
notation	1.35	0.9	3015	92	8
for	1.1	1	1333	37	3
sample	0.29	0.7	2993	16	6
statistic	1.08	0.8	7116	51	9

Keyword	CPC	PCC	Volume	Score
what is the notation for sample statistic	1.48	0.4	4388	55