statistics
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ShortExercise1.docxBUSA 2183 Introduction to Business Statistics
Summer 2019 –Session II
Short Exercise 1 (25 points)
Question 1 (Short Exercise 13 in the book) (8 points)
Place these variables in the following classification tables. For each table, summarize your observations and evaluate if the results are generally true. For example, salary is reported as a continuous quantitative variable. It is also a continuous ratio-scaled variable.
a.Salary
b.Gender
c.Sales volume of MP3 players
d.Soft drink preference
e.Temperature
f.SAT scores
g.Student rank in class
h.Rating of a finance professor
i.Number of home video screens
Table 1: (4 points)
|
|
Discrete Variable |
Continuous Variable |
|
Qualitative |
b. gender d. soft drink preference. |
|
|
Quantitative |
f. SAT scores g. student rank in class h. rating of a finance professor i. Nuber of home computers |
a. Salary c. sales volüme of MP3 Players e. temperature. |
Table 2: (4 points)
|
|
Discrete |
Continuous |
|
Nominal |
b. gender |
|
|
Ordinal |
d. soft drink preference g. students rank in class h. rating of a finance professor |
|
|
Interval |
f. SAT scores |
e. Temperature |
|
Ratio |
i. Number of home Computers |
a. Salary c. Sales Volume of MP3 players |
Question 2 (Short Exercise 17 in the book) (17 points)
The Wall Street Journal’s website, www.wsj.com , reported the total number of cars and light-duty trucks sold through February of 2016 and February of 2017. The top 16 of 29 manufacturers are listed here. Sales data often are reported in this way to compare current sales to last year’s sales. See the data file for the complete list and use it to respond to the following questions.
Data file can be found in the D2L.
Please, provide your answers under each question.
a. Using computer software, compare the 2016 year-to-date sales through February to the 2017 year-to-date sales through February for each manufacturer by computing the difference. Using computer software, sort the list of the manufacturers in order of largest to smallest difference in year-to-date sales. (5 points)
b. For each manufacturer, compare 2016 year-to-date sales through February to 2017 year-to-date sales through February by computing the percentage change in year-to-date sales using computer software. Using computer software, sort the list of manufacturers from largest to smallest using the percentage change.
b1: Which manufacturers are in the top five in percentage change? (2 points)
b2: Which manufacturers are in the bottom five in percentage change? (2 points)
c. Using computer software, sort the list of manufacturers from largest to smallest using 2017 year-to-date sales through February.
c1: Then, design a bar graph to illustrate the 2016 and 2017 year-to-date sales through February for the top 12 manufacturers. (3 points)
c2: Also, design a bar graph to illustrate the percentage change for the top 12 manufacturers. (3 points)
c3: Compare these two graphs and prepare brief written comments. (2 points)
