Quiz

Quiz 1

DIRECTIONS: Either type your letter response next to the question or highlight your letter response option. Otherwise, cut and paste or type your response directly in the space or table.

When finished the quiz, save your responses within this document in PDF format .

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1) Interval level variables have values that can be ranked from highest to lowest. (True or False)

2) A relative frequency distribution provides a running total of the frequencies in the classes. (True or False)

3) Generate the values in the cumulative frequency column for the table below:

Scores	Frequency	Cumulative Frequency
30 - under 40	1
40 – under 50	4
50 – under 60	5
60 – under 70	10
70 – under 80	20
80 – under 90	10
90 – under 100	5

4) Using the frequency table in question #3 above, approximately what percent of students scored more than 40?  Round answer to the nearest whole percent

5) Consider the following frequency distribution:

Class Interval Frequency

10-under 20   15

20-under 30   25

30-under 40   10

Based on the information given, how would you describe the shape of this distribution? Justify your response using details presented in the table.

6) A person has decided to construct a frequency distribution for a set of data containing 60 numbers.  The lowest number is 23 and the highest number is 68.  If 5 classes are used, the class width should be approximately _______.

a) 4

b) 12

c)  8

d)  5

e)  9

7) Consider the following stem and leaf plot:

Stem Leaf

1 0, 2, 5, 7

2 2, 3, 4, 8

3 0, 4, 6, 6, 9

4 5, 8, 8, 9

5 2, 7, 8

Use the Stem and Leaf plot to generate the original dataset. Use Excel to generate a descriptive numerical summary for this original dataset. Report your table generated. Discuss and justify the shape of the distribution using either the details in the Stem and Leaf plot or numerical details in the table you generated.

8) Each day, the manager at Jamie’s Auto Care prepares a frequency distribution and a histogram of sales transactions by dollar value of the transactions.  Friday's histogram follows.

Based on the histogram, which is the larger value the mean or the median? Justify your answer using descriptive statistic analysis techniques presented in class materials.

9) The staffs of the accounting and the quality control departments rated their respective supervisor's leadership style as either (1) authoritarian or (2) participatory.  Sixty-eight percent of the accounting staff rated their supervisor "authoritarian," and thirty-two percent rated him "participatory."  Forty percent of the quality control staff rated their supervisor "authoritarian," and sixty percent rated her "participatory." 

Use Excel to generate an appropriate chart to describe this data. Report your chart in the space below

10) The United Nations Development Program website provides comparative data by country on key metrics, such metrics as life expectancy over time. The table below show data on life expectancy over time in the United States.

Which of the following statements are not true based on the scatterplot of U.S. Life Expectancy

over time?

a. The life expectancy in the U.S. is increasing over time.

b. U.S. citizens lived fewer years in 2010 than they did in in 2008.

c. The scatterplot shows an increasing trend in life expectancy in the U.S.

d. Based on the scatterplot, one can assume the life expectancy in 2014 will be higher       than 78  years.

All of the above statements are true.

11) A cancer research group was interested in determining the percentage of women 40 years or older that have regularly scheduled mammograms. To accomplish this, they surveyed 500 women in this age group. Based on 155 women that responded affirmatively, estimate the percentage of all women in this age group that have regularly scheduled mammograms. Report the formula you used to generate this result.

12) Consider the following survey item:

Which level of measurement is the agreement variable? Justify your response.

13) At the following link, you’ll find a listing of NFL player salaries:

https://www.pro-football-reference.com/players/salary.htm

Create a table that contains the 5-number summary and the IQR for the dataset. Interpret the IQR. What is the shape of the salary distribution? Justify your response.

14) Liz Chapa manages a portfolio of 250 common stocks.  Her staff compiled the following performance statistics for two new stocks.

The coefficient of variation for Salas Products, Inc. is __________.

a) 300%

b) 100%

c) 33%

d) 5%

e) 23%