Suppose a survey revealed that 22% of 502 respondents said theyhad in the past sold unwanted gifts over the Internet.
(a) Use the information to construct a 90% confidence intervalfor the population proportion who sold unwanted gifts over theInternet, rounding your margin of error to the nearest hundredth.(Round your answers to two decimal places.)
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(b) Use the information to construct a 98% confidence interval forthe population proportion who sold unwanted gifts over theInternet, rounding your margin of error to the nearest hundredth.(Round your answers to two decimal places.)
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(c) Which interval has a higher probability of containing the truepopulation proportion?
the 90% confidence interval
the 98% confidence intervalĂ‚Â Ă‚Â Ă‚Â Ă‚Â
(d) Which interval is narrower?
the 90% confidence interval
the 98% confidence intervalĂ‚Â Ă‚Â
