A guidance counselor wishes to determine if the proportion of high school girls in his school district who have jobs are equal to the national average. He surveys 80 female students, ages 16 through 18, to determine if they work or not. The results are shown:     16-year-olds 17-year-olds 18-year-olds Work 45 31 38 Don’t work 35 49 42   With α = 0.01, can the researcher claim that the proportions of the girls who work are equal?

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