[問題] women over age 55...
a recent study endicated that 29% of the 100 women over age 55 in the study were widows.
questionA:how large a sample must one take to be 90 % confident that the estimate is within 0.05 of the true proportion of women over 55 who are widows?
questionB:if no estimate of the sample proportion is available, how large should the sample be ?
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