Keyword Analysis & Research: which of the following is a biased estimator

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
which of the following is a biased estimator	0.73	0.7	8900	20	44
which	0.98	1	2255	98	5
of	1.21	0.6	9233	65	2
the	0.65	0.9	2855	62	3
following	1.68	0.2	5646	65	9
is	1.35	0.4	6050	86	2
a	0.66	0.9	4502	28	1
biased	0.69	0.5	8102	75	6
estimator	1.2	0.4	6549	65	9

Keyword	CPC	PCC	Volume	Score
which of the following is a biased estimator	1.47	0.4	4504	31