5..3.lL During one of the first "beer wars" in the early 1980s, a laste test between Schlitz and Budweiser was t h.e focus of a nationally broadcast TV commercial. One hundred people agreed to drink from two unmarked mugs and indicate which of the two beers they liked better; fifty-four said ''Bud." Construct and interpret the corresponding 95 % oonfidence interval for p, the true proportion of beer-drinkers who prefer Budweiser to Schlitz. How would Budweiser and Schlitz executives each put these results in the besl possi ble light for their respective companies'!
5.3.12 If (0.57, 0.63) is a 50% confidence interval for p, wha t does equal and how many
observations were taken?
5..3.13. Suppose a coin is to be tossed II times for the purpose of estimating p, where
p = P(he.ads). How large must n be to guarantee that the length of the 99% confidence
interval for p will be less than 0.02?
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