28.(5%) Suppose we want to investigate the relationship between the heights of
students and the sport teams they belong to. Suppose we are considering four
different teams from the school: table tennis, basketball, baseball, and volley ball
teams. Linear regression model can be used to analyze the data collected for this
end with dummy variables. How many dummy variables should we create for this
model?
(A) 1
(B) 2
(C) 3
(D) 4
(E) 5
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