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13. n a random sample of 200 school district residents, 94 stated they are in favor of starting the school day 15 minutes later each

13. n a random sample of 200 school district residents, 94 stated they are in favor of starting

the school day 15 minutes later each day.

(a) Show that the conditions for calculating a confidence interval for a proportion are satisfied.

(b) What is the margin of error for a 90% confidence interval?

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