Suppose Bank of America would like to investigate if the credit score and income level of an individual are independent of one another. Bank of America selected a random sample of 400 adults and asked them to report their credit score range and their income range. The following contingency table presents these results. Credit ScoreClassLess than 650650-750More than 750Income < $50,000263024$50,000 ? Income < $100,000635344$100,000 ? Income < $150,000403030Income ? $150,000211722The degrees of freedom for the critical value is ________.
A. 3
B. 5
C. 6
D. 4
Answer: C
Business
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