What is the estimated probability that someone is optimistic

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You randomly sample 200 adults, determine whether their income is high or low, and ask them whether they are optimistic about the future. The results are

 

Yes

No

Total

High

35

42

77

Low

80

43

123

Total

115

85

200

What is the estimated probability that a randomly sampled adult has a high income and is optimistic? Compute a 0.95 confidence interval for the true probability using the R function binomci. What is the estimated probability that someone is optimistic, given that the person has a low income?

Reference no: EM131398581

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