1. The management of MBSG Ltd, an elite investment house, is interested in analysing thevariation in their revenue since inception. The summary statistics for 36 randomly selectedmonths are presented below.Revenue in Millions ofDollarsValid N (listwise)Expected Normal Value10Descriptive Statistics9N Minimum Maximum Mean Std. Deviation365.211.66.8191.2649Normal Q-Q Plot of Revenue in Millions of Dollars3668Observed Value1012

Given the summary statistics for the revenue for 36 randomly selected months as

Answered: 1. The management of MBSG Ltd, an elite…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Question

1. The management of MBSG Ltd, an elite investment house, is interested in analysing the
variation in their revenue since inception. The summary statistics for 36 randomly selected
months are presented below.
Revenue in Millions of
Dollars
Valid N (listwise)
Expected Normal Value
10
Descriptive Statistics
9
N Minimum Maximum Mean Std. Deviation
36
5.2
11.6
6.819
1.2649
Normal Q-Q Plot of Revenue in Millions of Dollars
36
6
8
Observed Value
10
12

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a) At the 90% level, estimate the standard deviation of the revenue for this company.
b) Using the estimate you created in (a), determine if the standard deviation is different from
$2 million.
c) Assuming that the population standard deviation is 1.5, determine the probability that the
sample standard deviation is greater than $2 million.
d) Now assume that the population standard deviation is not known. Determine that the
sample will produce a standard deviation that is as most ¾ of the population standard
deviation.
e) What assumption do you need to make for your results to be valid and determine if that
assumption is met. Explain why or why not.

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