e - King Fahd University of Petroleum and Minerals
e - King Fahd University of Petroleum and Minerals
e - King Fahd University of Petroleum and Minerals
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STAT 211 Business Statistics I 10<br />
Q6. (2+6+4=12 pts.) CNN TV poll asked 814 adults to respond to a series <strong>of</strong> questions about their<br />
feelings toward the state <strong>of</strong> affairs within the USA. A total <strong>of</strong> 562 adults responded “Yes” to the<br />
question: “Do you feel things are going well in the United States these days”<br />
a. What is the point estimate <strong>of</strong> the proportion <strong>of</strong> the adult population who feel thing are going<br />
well in the USA<br />
b. What is the 90% confidence interval for the proportion <strong>of</strong> the adult population who feel thing<br />
are going well in the USA<br />
c. How large a sample would be necessary to estimate the true proportion <strong>of</strong> the adult who feel<br />
thing are going well in the USA within 3%, with 95% confidence Assume p =0.69.
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