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CABARRUS COUNTY 2012 APPRAISAL MANUAL <br />The number 5.422 is the chi - square for this comparison. It is evaluated based upon what is known as DEGREES OF <br />FREEDOM of the problem and the use of a table of chi - square values common to most statistics texts. We may say here that <br />"degrees of freedom" means the latitude of variation a statistical problem has. It is the number of groups (Nk) minus 3 or V = <br />(N - 3). In this case V = 3. <br />Consulting our table, we find that the probability of having a chi - square due to chance of 5.42 is approximately .75 or <br />sufficiently different from .95 for us to state that the sales do differ significantly from the actual distribution of all parcels. <br />Hence, we would conclude that we should be careful in the extrapolation of sale parcel statistics to the entire distribution of all <br />parcels. <br />Cabarrus County — 2012 Revaluation <br />STATISTICS & THE <br />APPRAISAL PROCESS <br />10-12 <br />8/9/11 <br />Attachment number 11 <br />G -6 Page 307 <br />