Exercises 23: A mathematical department wants to attest if there is a gender bias in student evaluation of teaching. Rating where given by 150 students where 1 is very effective, 2 is effective, 3 is less effective and 4 for instructor that needs improvement. Determine the strength and direction of association, if any. Is the association significant? Very Effective Less Needs Indicators Effective Effective Improvement Male 36 15 21 Female 22 31 12 6

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