Question
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
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 |
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 from below 3
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 from below 3
No
Yes
Inconclusive
ii) travels at over 90 km/h at this location? Answerchoose 1 from below 3
No
Yes
Inconclusive
iii) might travel at 85km/hat this location?Answerchoose 1 from below 3
Yes
No
Inconclusive
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