You are a research scientist for the U.S. Department of Agriculture that has been asked to research the impact of permaculture and conventional farming methods on soil erosion. You identify 4 conventional farms, 4 permaculture farms, and 4 undisturbed natural areas. All of the farms and natural areas have streams that run nearby. Every week you measure the turbidity and sediment depth in the streams and compare the results after 2 years of data collection
a. Identify the independent variable(s) from the study above
b. Identify the dependant variable(s) from the study above.
c. List 2 variables that should be controlled in this study.
d. Why do you suppose 4 undisturbed natural areas were included in the study?
Solution: 8 A- the indipendant variables in the study are the numbers of different type of farms i.e. 4 conventional farms, 4 permaculture farms and 4 undisturbed areas.
Ans-B- the dependent variables include the turbidity and sediment depth of stream.
Ans-C- the two variables which should be controlled are turbidity and sediment depth of the stream.
Ans-D- four undisturbed natural area are included in this study to act as control sample.