Section 6.2 Homework Question 6

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Section 6.2 Homework Question 6

Question

Section 6.2 Homework

6.

According to an​ almanac,

​%

of adult smokers started smoking before turning 18 years old.

 
​(a) Compute the mean and standard deviation of the random variable​ X, the number of smokers who started before 18 in

trials of the probability experiment.

​(b) Interpret the mean.
​(c) Would it be unusual to observe

smokers who started smoking before turning 18 years old in a random sample of

adult​ smokers? Why?

 

​(b) What is the correct interpretation of the​ mean?

  1. It is expected that in​ 50% of random samples of 200 adult​ smokers, 140 will have started smoking before turning 18.
  2. It is expected that in a random sample of 200 adult​ smokers, 140 will have started smoking after turning 18.
  3. It is expected that in a random sample of 200 adult​ smokers, 140 will have started smoking before turning 18.

​

(c) Would it be unusual to observe 160 smokers who started smoking before turning 18 years old in a random sample of 200 adult​ smokers?

  1. No​, because 160 is greater than ì+2ó.
  2. Yes​, because 160 is greater than ì+2ó.
  3. ​Yes, because 160 is between ì−2ó and ì+2ó.
  4. ​No, because 160 is less than ì−2ó.

 

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This question is taken from Math 136 – Introduction to Statistics » Summer 2021 » Section 6.2 Homework