Refer to the new product development example in the overview of this module

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7. Suppose STAT2500 has 2 sections and the following table classifies the students according to their grade and sections.

Sec 1

Sec 2

A

20

18

B

12

14

C

7

5

Test if the grade and section of a student are independent at the .05 level of significance.

I am very confused on how to do this!  Could you please show all of your work?