A Pizza Hut store manager believes that the average number of customers who return a pizza...
A Pizza Hut store manager believes that the average number of customers who return a pizza or ask for a refund is 20 per day. The store records the number of returns and exchanges for the 25 days it was open during a given month. Are the returns different than 20 per day?
Sample mean= 25, s=5, n=25. Test at α = .01.
H0: µ = 20
H1: µ ≠ 20
interpret and conclude.
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