EXST7015 Daily Design 17
Carefully read the description of the experiment below. Be prepared to answer the questions that
follow the design description as a class quiz.
A student from an Agricultural Engineering school is studying the use of cow and pig manure as fertilizer (manure source is of interest). The manure was applied in one of two forms, fresh or processed (manure form is also
planting and again after 3 months. The processed
manure was applied every 3 days as a liquid effluent
from a “biodigester”. The four combinations were then
cow-fresh, pig-fresh, cow-effluent and pig-effluent.
The four combinations were applied to a cassava crop
for 5 months (1/12/97 to 30/4/98). The cassava plants
were arranged in three irrigated fields such that each treatment occurred once in each field in a randomly
assigned 4 x 2.5 m plot. Fields are a potential source of variation, but is not a source of interest. How would this experiment be analyzed if the variable of interest was the total combined biomass from two harvests (at 3 and 5 months) from the plots in each field, at total of 12 values?
Answer choices: (A) manure source (B) manure form (C) fields (D) total biomass (E) months (F) plot
– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –
Name Quiz Number Date / / 2011_
Circle the appropriate letter for each question.
1) What is the experimental unit for this experiment? A B C D E F
2) What is the sampling unit for this experiment? A B C D E F
3) What is the dependent variable for this experiment? A B C D E F
4) What is the treatment variable for this experiment? A B C D E F
5) If the design is RBD, what are the blocks? A B C D E F NA
6) Does it seem more likely that the treatments are fixed or random? (A) fixed (B) random
7) What is the treatment arrangement for this experiment? (A) single factor (B) factorial (C) nested
8) What is the experimental design? (A) CRD (B) RBD (C) LSD (D) Split-plot (E) Repeated Measures
9) The treatment degrees of freedom are _______________ .
10) The degrees of freedom for the error used for testing treatments are ____________________ .
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