Use the following to answer the questions below:
February 12, 2009 marked the 200th anniversary of Charles Darwin's birth. To celebrate, Gallup, a national polling organization, surveyed 1,018 Americans about their education level and their beliefs about the theory of evolution. The survey results are displayed in the provided two-way table. Note that the expected counts for most cells appear in parentheses.

-What are the degrees of freedom for the test?
A) 6
B) 4
C) 3
D) 11

Question

Use the following to answer the questions below:
February 12, 2009 marked the 200th anniversary of Charles Darwin's birth. To celebrate, Gallup, a national polling organization, surveyed 1,018 Americans about their education level and their beliefs about the theory of evolution. The survey results are displayed in the provided two-way table. Note that the expected counts for most cells appear in parentheses.
 
-What are the degrees of freedom for the test?
A) 6 
B) 4 
C) 3 
D) 11

Quizplus · Accepted Answer

The degrees of freedom for the test is the number of independent observations minus the number of parameters estimated. In this case, we have 6 independent observations (the 6 measurements) and 2 parameters estimated (the mean and the standard deviation). Therefore, the degrees of freedom is 6 - 2 = 4.

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