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# Statistical calculation on collected data

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5. Road accident researchers were interested in the effectiveness of Red Light cameras that can photograph the number plates of cars if they pass through an intersection on a red light. Researchers arranged for speeds to be measured as cars entered intersections. There were two factors under consideration - Presence or Absence of a red light camera, and whether cars were facing a Green or Amber light. The data was collected at four times of day.

(a) Did the colour of the light (Green or Amber) influence speed, i.e. was there a main effect of Colour. On a standard answer sheet, state clearly the null and alternative hypotheses (in words) in terms of the effects on light Colour on speed. Attach your calculations, the appropriate statistical decisions, and report your findings as would be done for a journal article

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Statistical calculation on collected data

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Hi,

I began to look at the attached file. It seems like you are reporting the results of a visual experiment, ...

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