### Recent Question/Assignment

Melbourne; North Sydney
Semester 2, 2018
STAT600: DATA ANALYSIS and INTERPRETATION
Assignment 1
Total Marks: 30
Instructions:
Marks and feedback comments are expected to be posted on LEO by Sep, 10, 2018, 9 am.
Question 1
(14 marks)
Do you think daily temperatures have an impact on coffee consumption?
A café manager noted the number of coffee sold in a random sample of 50 days, which had very different daily temperatures, over a year.
Required
a) Compute the following descriptive statistics with the data provided:
(4 marks)
i) Mean:_______________________
ii) Median:______________________
iii) Standard Deviation:_____________
iv) Coefficient of Variation:_________
b) Draw a boxplot of the data.
(2 marks)

c) If you were the café manager, would you form an opinion that daily temperatures have an impact on the variation of coffee consumption (high, medium or low), based on your answers in a) and b)? Please explain.
(3 marks)
i) High, medium or low:__________________________
ii) Justification:________________________
d) Please suggest 2 plausible factors other than daily temperatures that you consider would have an impact on coffee consumption. Could you explain the impact of each of these two factors on coffee consumption with the same data provided? Please explain.
(5 marks)
i) Factor 1:_____________________
ii) Factor 2:_____________________
iii) Yes or no:____________________
iv) Explanation:__________________

Question 2
(12 marks)
a) The following is a line chart of crimes over a period of 21 years in Country ABC.

Required
(4 marks)
i) What is your opinion on the trend of violent crimes?
ii) Please suggest a factor (other than the factors in b) and c)) and explain how the factor would have an impact on the trend.
i) Opinion on trend:_________________
ii) Factor:_____________________________________
Explanation on impact:_________________________

b) The following is a scatter plot of the same violent crimes data versus a demographical variable: size of population.

Required
(4 marks)
i) What is your opinion on the trend of violent crimes against the size of the population?
ii) Please suggest a plausible explanation on how the size of population would have an impact on the frequency of violent crimes as depicted by the data.
i) Opinion on trend:_____________________________________
ii) Plausible explanation on impact:_________________________

c) There is a belief that a large proportion of the violent crimes are committed by people age 15 to 24.
The following is a scatter plot of the same violent crimes data versus a second demographical variable: population aged between 15 and 24.

Required
(4 marks)
i) What is your opinion on the trend of violent crimes against the population aged between 15-24?
ii) Please suggest a plausible explanation on how the size of population aged between 15-24 would have an impact on the frequency of violent crimes as depicted by the data.
i) Opinion on trend:_____________________________________
ii) Plausible explanation on impact:_________________________
Question 3
(4 marks)
What is the most important lesson you have learnt in presentation and interpretation of statistical data from undertaking the assignment? Please explain.
i) Lesson:
___________________________________________
ii) Explanation:
____________________________________________

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