Assume 25% of the adult population smokes. If you randomly choose 20 adults, ans

Question

Assume 25% of the adult population smokes. If you randomly choose 20 adults, answer the following. Round all numeric answers to 4 decimal places a. What was the individual object in the study? b. What information was collected from each object? c. Was that information qualitative or quantitative? d. List the given numeric information along with the correct symbols e. Fill in the following in context: rv X = f. What is the probability that exactly 5 of the adults are smokers? g. What is the probability that more than 6 of the adults are smokers?

Explanation / Answer

1) an adult

2) from each and every adult we collected the information that whether they smoked or not

3) it's a qualitative variable.

4) given that n = 20

Probability of success p = 0.25

5) random variable x = total number of successes.

6)(x= 5) = (20c5)*(0.25)^5*(1-0.25)^(20-5)

= 0.2023

7) p(x>6) = 1-p(x<= 6)

= 1-{(p0)+p(1)+p(2)+p(3)+p(4)+p(5)+p(6)}

= 1-0.7857 = 0.2143

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