Effectiveness of red light cameras

Question

Assignment:

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.  For this question you will be assigned data from one of these times of day on the basis of the first letter of your last name.
         If your last name begins with the letters A-E use data from Time 1
        If your last name begins with the letters F-K use data from Time 2
        If your last name begins with the letters L-R use data from Time 3
        If your last name begins with the letters S-Z use data from Time 4

(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 (e.g. F(1,18)=7.14, p<.05, η²=.65).
(b) Did presence or absence of a Red Light camera alter speed, i.e. was there a main effect of Camera.  On a standard answer sheet, state clearly the null and alternative hypotheses (in words) in terms of the effect of Red light camera on speed.  Attach your calculations, the appropriate statistical decisions, and report your findings as would be done for a journal article (e.g. F(1,18)=6.78, p<.05, η²=.50).
(c) Did the effects of light Colour and presence of Camera interact.  On a standard answer sheet, state clearly the null and alternative hypotheses (in words) in terms of an interaction of the effects of Camera and light Colour upon speed.   Attach your calculations, the appropriate statistical decisions, and report your findings as would be done for a journal article (e.g. F(1, 18)=2.10, p>.05, η²=.25).

TIME 1

	GREEN	AMBER
	10	30
	20	40
NO CAMERA	50	70
	80	100
	90	110
	GREEN	AMBER
	55	30
	50	35
CAMERA	40	50
	30	55
	25	90

TIME 2

	GREEN	AMBER
	40	85
	60	55
NO CAMERA	70	60
	80	70
	100	40
	GREEN	AMBER
	80	20
	70	20
CAMERA	60	30
	50	40
	40	50

TIME. 3

	GREEN	AMBER
	30	45
	50	50
NO CAMERA	70	70
	90	90
	110	105
	GREEN	AMBER
	40	45
	50	40
CAMERA	60	40
	80	60
	70	25

TIME 4

	GREEN	AMBER
	105	15
	90	20
NO CAMERA	80	40
	70	60
	60	70
	GREEN	AMBER
	30	110
	40	100
CAMERA	50	85
	60	60
	65	50