Question: In a preliminary study to determine whether the installation of a camera designed to catch cars that go through red lights affects the number of

In a preliminary study to determine whether the installation of a camera designed to catch cars that go through red lights affects the number of violators, the number of red-light runners was recorded for each day of the week before and after the camera was installed. These data are listed here. Can we infer that the camera reduces the number of red-lightrunners?

Monday Tuesday Wednesday 27 Sunda Day Before After Day Before After 18 21 18 24 19 Thursday 20 16 Friday Saturday 24 19 16 16

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