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A public transport users' group claims that, for people working in the central business district, it takes longer to get to work by car than it does by public transport. They randomly select 60 people who work in the central business district. Each person is asked to record their travel time to work on two separate occasions - once when they travel to work by public transport and once when they travel to work by car.

Which of the following designs was used in this study?

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