A manufacturer produces needles for a sewing machine in 5 units per parcel. The parcels are in boxes of 120 units. The manufacturer guarantees that only one out of 100 parcels is defective; however, the owner of a store thinks that at least 4 parcels out of 100 are defective. To solve the controversy, the manufacturer randomly chooses 18 boxes and checks the number of defective parcels. The results follow:

Number of defective parcels: 3, 1, 1, 2, 4, 2, 0, 1, 4, 1, 6, 2, 2, 3, 1, 4, 4, 2

Who is more likely to be right, the manufacturer or the store owner?

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