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lbvjy [14]
3 years ago
14

Pollsters are concerned about declining levels of cooperation among persons contacted in surveys. a pollster contacts 92 people

in the 18-21 age bracket and finds that 78 of them respond and 14 refuse to respond. when 284 people in the 22-29 age bracket are contacted, 265 respond and 19 refuse to respond. assume that 1 of the 376 people is randomly selected. find the probability of getting someone in the 22-29 age bracket or someone who refused to respond.
Mathematics
1 answer:
VashaNatasha [74]3 years ago
4 0
Probability = (total 22-29 age bracket + number of not respond and aged 18-                             21) / total people
                 = (284+14) / 376
                 = 0.792
                 = 0.79
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A survey reported that 70% of those responding to a national survey of college freshmen were interested in taking summer courses
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Answer:

95% confidence interval: (0.5717,0.8283)          

Step-by-step explanation:

We are given the following in the question:

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0.7 \pm 1.96(\sqrt{\dfrac{0.7(1-0.7)}{49}} ) = 0.7 \pm 0.1283 =(0.5717,0.8283)

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