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One sample intervals for proportions

Sabine, a twelfth-grader at a large high school, conducts a survey on how often her peers complete their homework. With her survey results, she constructs a 90%90\% confidence interval for the proportion of her fellow twelfth-graders that would respond that they completed their homework regularly.
How might Sabine decrease her margin of error?
Choose all answers that apply:
Choose all answers that apply: