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Suppose a survey revealed that 22% of 502 respondents said they had in the past sold...

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Question

Statistics

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.)
(  ,  )

(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.)
(  ,  )
(c) Which interval has a higher probability of containing the truepopulation proportion?

the 90% confidence interval

the 98% confidence interval    


(d) Which interval is narrower?

the 90% confidence interval

the 98% confidence interval  

Answer & Explanation Solved by verified expert
4.0 Ratings (504 Votes)
Solution Given thatn 502Point estimate sample proportion 0221 1 022 078a At 90 confidence level 1    See Answer
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