A researcher designs an experiment in which a rat is attracted to the end of a ramp that divides, leading to doors of three different colours. The researcher sends the rat down the ramp n = 90 times and observes the choices listed in Table 14.1. Does the rat have (or acquire) a preference for one of the three doors?

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Rat's Door Choices Door Green Red Blue Observed Count (0) 20 39 31