56 Satellite radio in cars. In the June 2007 survey on satellite radio subscriber service and usage...
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56 Satellite radio in cars. In the June 2007 survey on satellite radio subscriber service and usage conducted for the National Association of Broadcasters, a random sample of 501 satellite radio subscribers were asked, “Do you have a satellite radio receiver in your car?” The survey found that 396 subscribers did, in fact, have a satellite receiver in their car.
a. From the sample, calculate an estimate of the true proportion of satellite radio subscribers who have a satellite radio receiver in their car.
b. Form a 90% confidence interval for the estimate, part a.
c. Give a practical interpretation of the interval, part b.
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