Question

Do you think global warming will have an impact on you during your lifetime? A poll of 1,000 adults asked this question. Consider the responses by age groups shown below Age Response 18-29 30+ Yes 287 140 No 137 426 Unsure 2 What is the probability that a respondent 18-29 years of age thinks that global warming will not pose a serious threat during his/her lifetime? (Round your answer to four decimal places.) (a) 0481 (b) What is the probability that a respondent 30+ years of age thinks that global warming will not pose a serious threat during his/her lifetime? (Round your answer to four decimal places.) 0.60 (c) For a randomly selected respondent, what is the probability that a respondent answers yes? 0.427

Answer 1

	18 - 29	30+	Total
Yes	140	287	427
No	137	426	563
Unsure	8	2	10
Total	285	715	1000

a) We want to find, the probability that a respondent 18-29 years of age thinks that global warming will not pose a serious threat during his/her lifetime.

That is to find, P(No | age 18-38)

P(No | age 18-38) = 137 / 285 = 0.4807

Therefore, required probability is 0.4807

b) We want to find, the probability that a respondent 30+ years of age thinks that global warming will not pose a serious threat during his/her lifetime.

That is to find, P(No | age 30+)

P(No | age 30+) = 426 / 715 = 0.5958

Therefore, required probability is 0.5958

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