SOLUTION: A supermarket wants to estimate the percentage of shoppers paying cash for their purchases. On a particular day 526 of the 950 shoppers who made purchases at the supermarket paid i
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Question 1196345: A supermarket wants to estimate the percentage of shoppers paying cash for their purchases. On a particular day 526 of the 950 shoppers who made purchases at the supermarket paid in cash. Calculate a 90% confidence interval for the percentage of shoppers paying cash for their purchases. Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! 90% half-interval is z(0.95)*sqrt(p91-p)/n)
p=526/950=0.554
so half-interval=1.645*sqrt(0.554*0.456)/950)
=0.027
the interval is 0.554+/-0.027 or (0.527, 0.581)
