In a survey on supernatural experiences, 712 of 4011 adultAmericans surveyed reported that they had seen or been with aghost.
(a) What assumption must be made in order for it to beappropriate to use the formula of this section to construct aconfidence interval to estimate the proportion of all adultAmericans who have seen or been with a ghost? We need to assumethat there are only 712 adult Americans. We need to assume that the4011 people formed a random sample of adult Americans. We need toassume that the 4011 people were surveyed at a supernaturalconvention. We need to assume that the 712 people are the onlyAmericans who had seen or been with a ghost.
(b) Construct a 90% confidence interval for the proportion ofall adult Americans who have seen or been with a ghost. (Round youranswers to three decimal places.)
