A nationally representative survey of students in grades 7 to 12 asked about the

Question

A nationally representative survey of students in grades 7 to 12 asked about the experience of these students with respect to sexual harassment. One question asked how many times the student had witnessed sexual harassment in school. Here are the data categorized by gender: Compute the chi-square statistic and the P-value. chi^2 (plusminus 0.001) = df = P(plusminus 0.001) = Use software) = Conclusion: There is an association between gender and seeing sexual harassment There is no association between gender and seeing sexual harassment

Explanation / Answer

from above:

X2 =21.543

df=2

P=0.0000

There is an association

Observed O never once more then once Total girls 138 193 676 1007 boys 110 121 737 968 Total 248 314 1413 1975 Expected E=rowtotal*column total/grand total never once more then once Total girls 126.449 160.100 720.451 1007 boys 121.551 153.900 692.549 968 Total 248 314 1413 1975 chi square =(O-E)^2/E never once more then once Total girls 1.055 6.7607 2.7426 10.559 boys 1.098 7.033 2.853 10.984 Total 2.153 13.794 5.596 21.5425

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