5. 223 More rain? The changing climate might affect the amount of rain that falls during different seasons. Eighteen plots of open grassland, each with an area 70 square meters, were available for a study. One response variable is total plant biomass produced in a plot over a year. Kenwyn Suttle of the University of California at Berkeley and his coworkers wanted to compare the effects of three treatments: added water equal to 20% of annual rainfall either during January to March (winter) or during April to June (spring), and no added water (control). Explain why it was necessary to include a control group that didn't get additional water. 48

MATLAB: An Introduction with Applications
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5.
More rain? The changing climate might affect the amount of rain that
falls during different seasons. Eighteen plots of open grassland, each with
an area 70 square meters, were available for a study. One response
variable is total plant biomass produced in a plot over a year. Kenwyn
Suttle of the University of California at Berkeley and his coworkers
wanted to compare the effects of three treatments: added water equal to
20% of annual rainfall either during January to March (winter) or during
April to June (spring), and no added water (control). Explain why it was
necessary to include a control group that didn't get additional water. 48
Transcribed Image Text:5. More rain? The changing climate might affect the amount of rain that falls during different seasons. Eighteen plots of open grassland, each with an area 70 square meters, were available for a study. One response variable is total plant biomass produced in a plot over a year. Kenwyn Suttle of the University of California at Berkeley and his coworkers wanted to compare the effects of three treatments: added water equal to 20% of annual rainfall either during January to March (winter) or during April to June (spring), and no added water (control). Explain why it was necessary to include a control group that didn't get additional water. 48
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