Question: The table in Exercise 24 shows whether NEJM medical articles during various time periods included statistics or not. We're planning to do a chi-square test.

The table in Exercise 24 shows whether NEJM medical articles during various time periods included statistics or not. We're planning to do a chi-square test.
In Exercise 24

a) How many degrees of freedom are there?
b) The smallest expected count will be in the 1989/No cell. What is it?
c) Check the assumptions and conditions for inference.

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