The soft-drink cups at a certain fast-food restaurant have tickets attached to them.  Customers peel off the tickets to see whether they win a prize.  The proportion of tickets that are winners is p = 0.25.  A total of n = 70 people purchase soft drinks between noon and 1:00 PM on a certain day.  Let  be the proportion that win a prize.  Find the standard deviation of p hat

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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The soft-drink cups at a certain fast-food restaurant have tickets attached to them.  Customers peel off the tickets to see whether they win a prize.  The proportion of tickets that are winners is p = 0.25.  A total of n = 70 people purchase soft drinks between noon and 1:00 PM on a certain day.  Let  be the proportion that win a prize.  Find the standard deviation of p hat

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