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An animal control employee wanted to estimate how many people owned cats and how many owned dogs. To do this he polled the first few houses in several neighborhoods. His findings are shown below:

Sample #	1	2	3	4	5	6	7
Dog	51	51	50	52	52	49	48
Cat	40	40	40	44	44	44	42

Based on the information presented what can you infer about which type of pets there are?

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