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STAT6202
InCourse Assessment
2010/2011
NAME:
GROUP:
CALCULATOR TYPE:
Marks will not only be given for the final (numerical) answer but also for the accuracy and clarity of your
answer. As such, make sure to write down your workings, e.g. formulae, calculations, reasoning.
This is an open book test. Only college approved calculators are allowed.
1. Management of a large multinational company are concerned about the time employees spent on the
internet. As such they have monitored the internet usage by each employee for the past week. The
following box plot summarizes the collected data about internet time (in minutes) by individual employees
over the past week:
(a) What type of data is “time spent on the internet by an employee”?
[4 marks]
Continuous data
(b) What percentage of employees spent approximately between 200 and 500 minutes on the internet
during the past week? Explain.
[8 marks]
•
The box plot shows that the upper quartile is 500 minutes.
•
The box plot shows that the lower quartile is 200 minutes.
•
As such 50% of all employees spent between 200 and 500 minutes on the internet in the past
week
(c) If management hadn’t recorded the internet activity of all employees but only of a large random
sample of employees, would you expect the average time spent on the internet during the past week
in the sample to be bigger, equal or smaller than 300 minutes? Explain.
[13 marks]
•
The box plot shows that the population median (i.e. all employees) is 300 minutes.
•
The data are right or positively skewed and as such the population mean is expected to be bigger
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This note was uploaded on 12/07/2011 for the course STAT 6202 taught by Professor Rahman during the Spring '11 term at UCL.
 Spring '11
 Rahman

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