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

Does this data represent a population or a sample? AnswerPopulationSampleNeither

How many observations were reported? Answer 10

Calculate the following:

Mean	Answer 85
Median	Answer85
Mode	Answer85
Range	Answer25
Standard Deviation	Answer8.16
Skewness (sk)	Answer0

How symmetrically distributed is this data? Answer

Significantly Positively Skewed

Significantly Negatively Skewed

Approximately Symmetrical

Perfectly Symmetical

Part 2

If order for the police to decide whether or not to be concerned about this data,

they want to develop a 90% confidence interval.

Should at orz distribution be used? Answer choose 1

z-distribution

t-distribution

Neither

Calculate the following:

t or z value	Answer
Margin of Error	Answer
Lower limit	Answer
Upper limit	Answer

Based on this confidence interval, is it reasonable to say that the average driver:

i) exceeds the speed limit at this location? Answer choose 1

No

Yes

Inconclusive

ii) travels at over 90 km/h at this location? Answer choose 1

No

Yes

Inconclusive

iii) might travel at 85km/hat this location?Answer choose 1

Yes

No

Inconclusive