Fa10SampFinal

Fa10SampFinal - STAT 8200 Final Exam – Sample SHOW ALL...

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Unformatted text preview: STAT 8200 Final Exam – Sample SHOW ALL WORK! Name: 1. Suppose that we wish to study the effects of three factors on cotton yields: nitrogen added, planting depth, and planting date. The nitrogen and depth factors have two levels each, and the date factor has three levels. There are 24 plots available: 12 in Griffin, GA, and 12 in Tifton, GA. a. (8 pts.) Briefly desribe the design of an experiment appropriate for this situation. Be sure to identify the experimental design, its treatment and design structures, the experimental units to be used in the design, and the response variable to be measured. 1 b. (5 pts.) For the experiment you described in part (a), write down a model that would be appropriate for analyzing the resulting data. In addition, write down a skeleton ANOVA table that gives both sources of variability and degrees of freedom. 2 2. Every year, the Girl Scouts sell cookies to make money for their organization. The Girl Scout leaders want to find out how to sell even more cookies in the future. The variables they have to work with are type of sales (two levels: door- to-door sales or table sales at grocery stores, malls, etc.) and cookie selection (four levels, comprising four different “menus” of different cookie types offered to customers). Administratively, the Girl Scouts are organized into “councils” (large groups) consisting of many “troops” (small groups) of about 30 girls each. Each troop in the experiment will be assigned a particular menu and sales type for the year, and for logistical reasons, all the troops in a given council should have the same cookie menu. Sixteen councils have agreed to participate in the experiment. a. (10 pts.) Design an experiment appropriate for this situation. Be sure to identify the experimental design, identify the experimental unit(s), identify all treatment and blocking factors and the number of levels of each factor, and describe the randomization. You may find that a picture or schematic of the design is helpful. 3 3. Japanese beetles ate the Roma beans in our garden last year, so we ran an ex- periment this year to learn which pesticide is best at suppressing them. We have six garden beds with beans, and the garden store has three different sprays (A, B, and C) that claim to keep the beetles off the beans. Sprays drift on the wind, so we cannot spray very small areas. We divide each bed into two plots and use a different spray on each plot (dividing a bed into three plots would make the plots too small to spray individually). Below is the design and data from this experiment. Bed Half-bed 1 2 3 4 5 6 1 A 19 B 25 C 16 A 9 B 13 C 33 2 B 21 C 30 A 11 B 11 C 18 A 26 Attached is a SAS program beetle.sas and its output beetle.lst that analyze these data. Please refer to these print-outs for this questions....
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This note was uploaded on 11/13/2011 for the course STAT 8200 taught by Professor Staff during the Fall '08 term at UGA.

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Fa10SampFinal - STAT 8200 Final Exam – Sample SHOW ALL...

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