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A professor tests whether the loudness of noise during an exam (low, medium, and high) is independent of exam grades (pass, fail). The following table

A professor tests whether the loudness of noise during an exam (low, medium, and high) is independent of exam grades (pass, fail). The following table shows the observed frequencies for this test.

Noise Level

Exam Low Medium High

Pass 21 17 9

Fail9 7 11

30 24 20 N=74

Conduct a chi-square test for independence at a 0.05 level of significance. (Round your answer to two decimal places.)

X2obt=

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