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? choose one

Population/Sample/Neither

How many observations were reported? Answer........

Calculate the following:

Mean	Answer
Median	Answer
Mode	Answer
Range	Answer
Standard Deviation	Answer
Skewness (sk)	Answer

How symmetrically distributed is this data? choose one from four options

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 todevelop a 90% confidence interval.

Should atorzdistribution be used? choose one from three options

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 theaveragedriver:

i) exceeds the speed limit at this location? AnswerNo/Yes/Inconclusive

ii) travels at over 90 km/h at this location? AnswerNo/Yes/Inconclusive

iii) might travel at 85km/hat this location?AnswerYes/No/Inconclusive

Part 3

What does FPC stand for? AnswerFeline Patrol CommissionFinite Percentage CorrelationFunny Penguin ConventionFinite Population CorrectionFuzzy Paws Catalogue

What expression below is used to calculate an FPC? AnswerABCD

Calculate the FPC for this data Answer

What rule of thumb is used to determine whether an FPC should be used?

choose 1 from left below choose 1 from right below

s/p 5

n/N < 0.05

N/n 10^-10

123

Calculate the rule of thumb for this data Answer

Should an FPC be used to correct the standard error for this data? Answer choose one from below options

No

Can't tell

Yes

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