(b) Method of determining number and location of samples.

1. (1) The minimum sample size for each county size shall be determined by the population of the county as reflected in the latest final census figures and the number of businesses therein.

2. (2) Those counties with populations of:

   1. (A) Twenty-nine thousand nine hundred ninety-nine (29,999) and below shall have forty (40) samples;
   2. (B) Thirty thousand (30,000) to sixty-nine thousand nine hundred ninety-nine (69,999) shall have seventy (70) samples;
   3. (C) Seventy thousand (70,000) to one hundred ninety-nine thousand nine hundred ninety-nine (199,999) shall have one hundred (100) samples; and
   4. (D) Two hundred thousand (200,000) and above shall have one hundred eighty (180) samples.

(c) Selection of samples.

1. (1) The Field Auditor shall be instructed to get random samples of:

   1. (A) Automobiles from the current year through the last fifteen (15) years; and
   2. (B) Trucks from the current year through the last fourteen (14) years.
2. (2) Only one (1) vehicle shall be taken from each assessment.

(d) Procedure. In August, the Field Auditor shall:

1. (1) Return to each county after the county has completed its personal property assessments for the current year; and
2. (2) Complete the Personal Property Takeoff Form.

(f) Formulas utilized and tests conducted.

1. (1) Median, see Standard on Ratio Studies, approved July 1999, International Association of Assessing Officers, or current edition.
2. (2) Coefficient of dispersion, see Standard on Ratio Studies, 1999, International Association of Assessing Officers, or current edition.

3. (3) Not required, but also computed:

   1. (A) Mean, see Standard on Ratio Studies, approved July 1999, Association of Assessing Officers, or corresponding provisions contained in any superseding edition of same;
   2. (B) Average absolute deviation, see Property Appraisal and Assessment Administration, published by the International Association of Assessing Officers, 1990 edition, or current edition;
   3. (C) Coefficient of concentration:

(i) Of the samples that are used, the percentage of observations that are within plus or minus ten percent (10%) of the legal ratio of twenty percent (20%); and

1. (ii) Of the samples that are used, the percentage of observations that are within plus or minus ten percent (10%) of the median ratio;

   1. (D) Weighted mean, see Standard on Ratio Studies, approved July 1999, International Association of Assessing Officers, or current edition;
   2. (E) Standard deviation, see Property Appraisal and Assessment Administration, published by the International Association of Assessing Officers, 1990 edition, or current edition;
   3. (F) Price-related differential, see Standard on Ratio Studies, approved July 1999, International Association of Assessing Officers; and
   4. (G) Coefficient of variation, see Standard on Ratio Studies, approved July 1999, International Association of Assessing Officers, or current edition to select sample sizes.