Statistics and Research Methods for Business Decision Making

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Statistics and Research Methods for Business Decision Making
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Statistics and Research Methods for Business Decision Making
Question 1: ANALYSIS OF CO2 Emissions by the Top 15 producer Countries
Solution
a. To represent the amount of carbon dioxide emitted by different countries in
the year 2009 and in the year 2013 expressed in millions of metric tons, we
use the stacked bar graph shown below.
b. To correctly, represent the amount the carbon dioxide emitted by the top 15
producers in the years 2009 and 2013 expressed as percentage, we use the
stacked bar chart shown in the figure below.

c. From the stacked bar graphs above indicating the emissions of carbon
dioxide in metric tons and as a percentage of the total respectively, it is
evident that China was the highest emitter of the gas, followed by the Unites
States of America. The other countries in the top five are India, Russia and
Japan. The least emitters are France, Italy, South African and Australia. The
graphs also show a comparison of the amount of carbon dioxide release in
the year 2009 and in the 2013. For example, China emitted more gas in 2013
than it did in 2009. On the other hand, United States emitted more gas in
2009 than it did in the 2013.
Question 2: Analysis of Time Taken by Assembly-Line Workers to Complete
Vehicle Assembly.
a. The table showing the distribution of frequency and the distribution of
relative frequency for the data provided about the amount of time taken by

the assembly line workers to complete a unit assembly is shown below. A
class interval of 5 is chosen
b. The table showing the distribution of frequency and the distribution of
relative frequency for the data provided about the amount of time taken by
the assembly line workers to complete a unit assembly is shown below. A
class interval of 5 is chosen.
c. A plot of the relative frequency for the distribution of the data is illustrated in
the figure below. It is a plot of relative frequency of the vertical axis and the
class chosen of the horizontal axis (Croucher, 2016).