cashier records from last year show that 60% of all ralph\'s grocery store custo
ID: 2960635 • Letter: C
Question
cashier records from last year show that 60% of all ralph's grocery store customers use a previously obtained Ralph's discount card upon checkout. Management suspects the percentage of actual cardholders is higher because some customers may not use their Ralph's card during every visit. The decide to sample random customers who enter the sotre, and ask them if they have a Ralph's card. Suppose the solicit 400 customers one day and find that 250 of them have a Ralph's card.
what is the probability of getting a sample proportion at least .625
Explanation / Answer
P(P>.625) assuming pi=.6 (.625-.6)/sqrt(.6*.4/400)=1.02062073 15%
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