The number of degrees of freedom for the appropriate chi-square distribution in a test of independence is

a. k – 1.
b. number of rows minus 1 times number of columns minus 1.
c. a chi-square distribution is not used.
d. n -1

ur mom

step-by-step explanation:

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.