All of the following contributed to the Dust Bowl of the 1930s EXCEPT
A. dry-farming techniques.
B. unprecedented drought and wind storms of the trans-Mississippi Great Plains.
C. farmers' failure to use steam tractors and other modern equipment.
D. the cultivation of marginal farmlands on the Great Plains.
E. soil erosion.
Answer: C
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be independent, each with unknown mean ยต and known variance 
= 1.
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Answer the following statement true (T) or false (F)
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