Part 1

Cape Breton University is accessed from Grand Lake Road, which is a busy highway that carries 40 000 cars per day, with a posted speed limit of 80 km/h.

Below are vehicle speeds recorded in km/h by the Royal Canadian Mounted Police in front of CBU over a 10 minute period - the police want to know if there is a problem with speeding at this location.

85

70

95

90

85

90

75

85

95

80

Part 4

Consider the above to be a pilot study.

If the police now want to conduct a larger study that is more precise (i.e. a higher level of confidence with a smaller margin of error), how large of a sample size do they need?

Calculate the following to complete the table:

E	1 km/h
Level of Confidence	99%
z	Answer.....?
Standard Deviation	Answer.......?
What sample size (n) is required?	Answer.........?