Insight into Market Share and Usage of Mobile Phones by Students at La Trobe University

Cover Page
Research Project-2: BUS1BAN
Teacher’s Name
Workshop Details
(Time, day, room)
Students ID Number Students Name Student contribution*
(%)
e.g. 50% means the
student will receive 50%
of the marks awarded
Students Signature
*All group members are to exert an equal amount of effort on all questions of the assignment.
Students should not divide sections. If a student has contributed to only some sections, the
contribution of the student should be equal to the marks it carries. A student with less than
100% contribution will receive marks proportional to their contribution.
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An insight into market share and usage of
mobile phones by students at La Trobe University
Note: Students would continue to be the part of the same group as were
for research project-1 and would be utilising the data from the same
random sample that they have already submitted earlier.
Inferential Statistics
1. Point Estimate and Confidence Interval: (20 marks)
A. Suppose you randomly select a student from BUS1BAN class, how likely
is it that the student selected will be: (5 marks)
 A female;
 A male;
 An IPhone user;
 A Samsung Galaxy user.
Proportion ( ^p)
Female Students 0.52
Male Students 0.48
IPhone Users 0.753
Other Smart Phone Users 0.093
B. Estimate 95% confidence interval of the proportion of female students and the
proportion of Other Smart Phone User. Show the confidence intervals
graphically, and interpret your results. (You must show the formula and show
working by putting values in the formula accordingly): (5 marks)
i.Female Students (2.5 marks)
Lower limit = 0.44
Upper limit = 0.60
This results show that 95% of the times the proportion of females will always
be between 0.44 and 0.60
2

ii.Other Smart Phone Users (2.5 marks)
Lower limit = 0.047
Upper limit = 0.139
This results show that 95% of the times the proportion of those who use
other smartphones will always be between 0.047 and 0.139
Proportion of females Proportion of other smartphone users
0
0.1
0.2
0.3
0.4
0.5
0.6
95% C.I for proportion
Figure 1
C. What are the average monthly earnings of male and female students at
La Trobe? (5 mark)
Female Male
Average Monthly
Earnings ($)
1004.47 1227.76
D. Provide 95% confidence interval of the average monthly earnings for each
gender, show the confidence intervals graphically, and interpret your answer.
(5 marks)
i.Female (2.5 marks)
Lower limit 829.02
Upper limit 1179.92
ii.Male. (2.5 marks)
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