1. The American Journal of Public Health (July 1995) published a study of the relationship between passive smoking and nasal allergies in Japanese female students. The study revealed that 80% of students from heavy-smoking families showed sign of nasal allergies on physical examinations. Consider a sample of 25 Japanese female students exposed daily to heavy smoking. a. What is the probability that fewer than 20 of the students will have nasal allergies? b. What is the probability that more than 15 of the students will have nasal allergies? c. What is the probability that exactly 15 of the students will have a nasal allergy?

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A:

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A: From the provided information, Mean (µ) = 1550 Standard deviation (σ) = 300 X~N (1550, 300)

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A:

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A: Binomial distribution...

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A:

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A:

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.