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Stat 4 MGMT II

The document is an individual assignment for a statistics course at Haramaya University, requiring students to provide their personal information and complete the assignment independently by the final exam deadline. It includes questions on sampling types, sample size calculations for light bulb lifetimes and tourist spending, and hypothesis testing for fuel consumption. Students must ensure their work is neat, complete, and original to avoid disqualification.

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obsakenasa2010
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56 views2 pages

Stat 4 MGMT II

The document is an individual assignment for a statistics course at Haramaya University, requiring students to provide their personal information and complete the assignment independently by the final exam deadline. It includes questions on sampling types, sample size calculations for light bulb lifetimes and tourist spending, and hypothesis testing for fuel consumption. Students must ensure their work is neat, complete, and original to avoid disqualification.

Uploaded by

obsakenasa2010
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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HARAMAYA UNIVERSITY

COLLEGE OF BUSINESS AND ECONOMICS

DEPARTMENT OF. MANAGEMENT

INDIVIDUAL ASSIGNMENT

COURSE: STATISTICS FOR MANAGEMENT II

GENERAL INSTRUCTION:

Your answers should be neat & complete

Never try copy others work that's a sin and result in disqualification of your results.

It should clearly contain all the necessary information about the student (Name, ID, and Department of
the student).

Work the assignment individually

The deadline for submission is during final exam.


QUESTIONS :
1). Discuss the types of sampling?(probability sampling, non probability sampling and their
types)

2). The average life time of a light bulb is 3000 hours with a standard deviation of 690 hours. A
sample of 36 bulbs is taken.

How large of a sample needs to be taken to provide a 0.01 probability that the average life time
in the sample will be equal to or greater than 3219.24 hours? Z 0.01= 2.33

3).Ethio Travels and Tours PLC would like to estimate the mean amount of money spent by a
tourist to be within Birr 100 with 95% confidence.

If the amount of money spent by tourist is considered to be normally distributed with a


standard deviation of Br 210, what sample size would be necessary for the PLC to meet their
objective in estimating this mean amount?

4). For the year 2013 (E.C), the average fuel consumption of HU vehicles was 200 liters per day
and the standard deviation is 90 liters per day. The manager of the system claims that the average
fuel consumption has increased this year. Assume that – to test the claim, the manager sampled
40 vehicles of HU, and the mean of selected vehicles’ fuel consumption is 160 liters per day.
Formulate hypothesis testing with 1% α; assume the distribution is normally distributed.

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