the PLANTS1 data file gives the percent of nitrogen in four different species of
ID: 3365495 • Letter: T
Question
the PLANTS1 data file gives the percent of nitrogen in four different species of plants grown in a laboratory. theresearchers who collected these data in parts of the country where there is very little rainfall. To examine the effect of water, they varied the amount per day from 50mm to 650mm in 100mm increments. Tere wer 9 plants per species-by-water combination. Because the plants are to be used primarily for animal food, with some parts that can be consumed by people, a high netrogen content is very desirable.
(1) What is the response variable?
(2) What are the explanatory variables(factors) and levels of each?
(3) Is this an experiment? why?
(4) what are the experimental units?
(5) what are the treatments?
Explanation / Answer
Result:
the PLANTS1 data file gives the percent of nitrogen in four different species of plants grown in a laboratory. The researchers who collected these data in parts of the country where there is very little rainfall. To examine the effect of water, they varied the amount per day from 50mm to 650mm in 100mm increments. There were 9 plants per species-by-water combination. Because the plants are to be used primarily for animal food, with some parts that can be consumed by people, a high netrogen content is very desirable.
(1) What is the response variable?
percent of nitrogen content
(2) What are the explanatory variables(factors) and levels of each?
water ( 7 levels, 50mm to 650mm in n 100mm increments )
species ( 4 levels)
(3) Is this an experiment? why?
This is experiment because some intervention is present.
(4) what are the experimental units?
The plants are the experimental units.
(5) what are the treatments?
Different amounts of water (50mm to 650mm ).
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