A class has 420 students. The final examination is optional--taking it can raise, but not lower, a
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A class has 420 students. The final examination is optional--taking it can raise, but not lower, a student's grade. Of a random sample of eighty students, thirty-one indicated that they would take the final examination. Find a 90% confidence interval for the total number of students in this class intending to take the final examination.
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