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2. A doctor believes that less than 80% of 2-year-old boys are taller than 33 inches....

2. A doctor believes that less than 80% of 2-year-old boys are taller than 33 inches. A random sample of 300 2-year-old boys revealed that 250 of them are taller than 33 inches. Test the doctor’s belief at the 5% level of significance.
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