Miss. Code. tit. 11, pt. 8, ch. 2, app 11-8-2-A, 11-8-2-11-8-2-A-P
Rules 2,4,5
In performing statistical comparisons for hay production when a whole field is harvested, the weights of either ten percent or fifteen small bales, whichever is greater; or ten percent or fifteen round bales whichever is greater are converted to lbs./ac. and compared to one hundred percent of the reference or target yield, using a ninety percent or greater statistical confidence level as approved by the Permit Board in consultation with the USDA/NRCS. Release area harvest data must be compared to 100% of the reference or target yield for prime farmland and to 90% of the reference area or target yield for all other land uses. See the following example.
Null hypothesis: hay yield on release area > 100% reference or target yield
Alternate hypothesis: hay yield on release area < 100% reference or target yield
| Example: | size of release area: | 40 acres |
| number of bales harvested: | 125 | |
| number of bales weighed: | 15 |
Release Area Harvest Data
| * weight per round bale (x) -lbs- | x2 | 100% reference area or target yield |
| 1,100 | 1,210,000 | |
| 1,000 | 1,000,000 | 3,200 lbs/ac |
| 975 | 950,625 | |
| 900 | 810,000 | |
| 1,000 | 1,000,000 | |
| 1,100 | 1,210,000 | |
| 1,000 | 1,000,000 | |
| 900 | 810,000 | |
| 1,025 | 1,050,625 | |
| 1,000 | 1,000,000 | |
| 875 | 765,625 | |
| 975 | 950,625 | |
| 1,000 | 1,000,000 | |
| 1,100 | 1,210,000 | |
| 1,150 | 1,322,500 | |
| [SIGMA]x = 15,100 | [SIGMA]x2 = 15,290,000 |
* adjusted for differing soil series as per Addendum Q.
to determine the t-value, refer to Addendum G.
the degree of freedom is the number of samples (n) - 1
we had 15 samples, subtracting 1 = 14.
fourteen (14) degrees of freedom = 1.345 from column t. = .10
therefore, the formula to calculate t value from the harvest data is:
Since 1.79 is greater than 1.345, the null hypothesis is rejected. Crop yield data from the test area is different from the yield from the reference area.
Miss. Code. tit. 11, pt. 8, ch. 2, app 11-8-2-A, 11-8-2-11-8-2-A-P