In this research an applied study which is designed in accordance with the Completely Randomized Block Design (CRBD) was conducted on a field experiment of the eggplant crop grown under the environment of green houses where as the production (measured in kilograms) represents the response variable (Y) . The experiment is based on three explanatory variables, they are: X1 is the strain of eggplants , X2 is the concentration level of Nitrogen fertilizer , and X3 is the block where the blocks represent the places selected for farming . After completing the overall analysis, estimation, and the use of graphs , a set of conclusions and recommendations were reached such as knowing the optimum percentages of the experimental factors which lead to increasing the production of the crop under study and finding a simplified way to get the estimated values of the studied response variable .

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