[INSERT TITLE HERE] 1
Running head: [INSERT TITLE HERE]
[INSERT TITLE HERE]
Student Name
Allied American University
Author Note
This paper was prepared for [INSERT COURSE NAME], [INSERT COURSE
ASSIGNMENT] taught by [INSERT INSTRUCTORS NAME].
Part I
Direct
The coefficient of variation for a set of annual incomes is 18%; the coefficient of variation for
the length of service with the company is 29%. What does this indicate?
A) More dispersion in the distribution of the incomes compared with the dispersion of
The percentile range is the distance between any two _.
Answer: percentiles
73. In a symmetric distribution, where is the 99th percentile located?
_
Answer: In the far right tail
Difficulty: Medium
Goal: 3
74. In a positively skewed distribution, where is
Chapter 4
Describing Data: Displaying and Exploring Data
Quartiles divide a distribution into four equal parts.
Answer: True
13. A percentile divides a distribution into one hundred equal parts.
Answer: True
Difficulty: Medium
Goal: 3
AACSB: AS
14. A stud
A percentile can be a decile, but a decile can not be a quartile.
Answer: True
19. A quartile can be a decile, but a decile can not be a percentile.
Answer: False
Difficulty: Easy
Goal: 3
20. For a distribution, the 2nd quartile, the 5th decile, and the 5
What is the best way to display the relationship between two variables measured on an
interval or ratio level?
Answer: scatter diagram
71. What is the main advantage of a stem-and-leaf chart over a histogram?
_
Answer: The identity of each observation is
In a contingency table, we describe the relationship between
A) two variables measured at the ordinal or nominal level.
B) two variables, one measured as an ordinal variable and the other as a ratio variable
C) two variables measured at the interval or ra
For a distribution, the 2nd quartile, the 5th decile, and the 50th percentile, are the same as the
median.
Answer: True
21. The interquartile range is the difference between the values of the first and third quartile,
indicating the range of the middle fi
Chapter 4
Describing Data: Displaying and Exploring Data
A student scored in the 85th percentile on a standardized test. This means that the student
scored lower than 85% of all students who took the test.
Answer: False
15. Quartiles are another way to de
What statistics are needed to draw a box plot?
A) Minimum, maximum, median, first and third quartiles
B) Median, mean and standard deviation
C) A median and an interquartile range
D) A mean and a standard deviation.
Answer: A
48. A box plot shows
A) The m
Module 4 Homework 1
Running head: Module 4 Homework
Module 4 Homework
Leah Cummings
Allied American University
Author Note
This paper was prepared for ECN 150, Module 4 Homework taught by Professor Danielle
Babb.
PART I
1.
For each of the following, deter
A scatter diagram of sales versus production may be constructed by plotting the data on a
graph labeled with sales on the Y-axis and production on the X-axis.
Answer: True
42. A relationship between gender and preference for Coke or Pepsi can be best repr
Multiple Choice
A dot plot shows
A) The general shape of a distribution
B) The mean, median, and mode
C) The relationship between two variables
D) The interquartile range.
Answer: A
45. A row of a stem-and-leaf chart appears as follows: 3 | 0 1 3 5 7 9. A
The 50th percentile of a distribution is the same as the distribution mean.
Answer: False
18. A percentile can be a decile, but a decile can not be a quartile.
Answer: True
Difficulty: Easy
Goal: 3
19. A quartile can be a decile, but a decile can not be a
In a scatter diagram, we describe the relationship between
A) two variables measured at the ordinal level
B) two variables, one measured as an ordinal variable and the other as a ratio variable
C) two variables measured at the interval or ratio level
D) a
The test scores for a class of 147 students are computed. What is the location of the test score
associated with the third quartile?
A) 111
B) 37
C) 74
D) 75%
Answer: A
47. What statistics are needed to draw a box plot?
A) Minimum, maximum, median, first
A large oil company is studying the number of gallons of gasoline purchased per customer at
self-service pumps. The mean number of gallons is 10.0 with a standard deviation of 3.0
gallons. The median is 10.75 gallons. What is the Pearson's coefficient of
What is the main advantage of a stem-and-leaf chart over a histogram?
_
Answer: The identity of each observation is not lost
72. The percentile range is the distance between any two _.
Answer: percentiles
Difficulty: Medium
Goal: 3
73. In a symmetric dist
Chapter 4
Describing Data: Displaying and Exploring Data
There is some loss of information when raw data is tallied into a stem-and-leaf display.
Answer: False
6. For a stem-and-leaf display, the leaf for the value 98 is 9.
Answer: False
Difficulty: Easy
What is the possible range of values for the coefficient of variation?
A) -1 and +1
B) -3 and +3
C) 0% and 100%
D) Unlimited values
Answer: C
56. A research analyst wants to compare the dispersion in the price-to-earnings ratios
for a group of common stoc
Chapter 4
Describing Data: Displaying and Exploring Data
In a stem-and-leaf display, it is easy to find the range for a data set.
Answer: True
12. Quartiles divide a distribution into four equal parts.
Answer: True
Difficulty: Easy
Goal: 3
13. A percentil
.
What is the difference between a scatter diagram and a contingency table?
Answer: A scatter diagram requires interval or ratio scaled variables, a contingency table
requires nominal or ordinal variables.
104. Draw a negatively or positively skewed distr
The "box" in a box plot shows the interquartile range.
Answer: True
24. An outlier is a data point that occurs in the first quartile.
Answer: False
Difficulty: Easy
Goal: 4
25. An outlier is a value in a data set that is inconsistent with the rest of the
.
What is the third quartile for the distribution of number of sales per hour? _
Answer: Q3 = 6.5 sales per hour
93. For the distribution of number of sales per hour, 50% are greater than
_
Answer: The median or 5 sales per hour
Difficulty: Medium
Goal: 4
What unit of measurement is used to express the coefficient of variation? _
Answer: percent
81. The coefficient of variation is a measure of _.
Answer: relative dispersion
Difficulty: Medium
Goal: 5
82. The research director of a large oil company conduct
Given the sample information in the following table regarding public opinion on gun control,
who is more likely to favor gun control
Answer: Republicans are more likely to favor gun control with 58% favoring gun control.
Only 38% of democrats favor gun co
.
What is the median value? _
Answer: 138 shipments,
Essay
102. What is the common purpose of a scatter diagram and a contingency table?
Answer: Both are used to summarize two variables:
Difficulty: Medium
Goal: 6, 7
103. What is the difference between a
The Pearson's coefficient of skewness (Sk) measures the amount of skewness and may range
from -3.0 to +3.0. It is computed by subtracting the median from the mean, multiplying the
result by 3 and dividing by? _
Answer: standard deviation
89. Given the sam
What is the value of the Pearson coefficient of skewness for a distribution with a mean of 17,
median of 12 and standard deviation of 6?
A) +2.5
B) -2.5
C) +0.83
D) -0.83
Answer: A
54. A study of business faculty at state supported institutions in Ohio re
Quartiles are another way to describe the dispersion of a distribution.
Answer: True
17. The 50th percentile of a distribution is the same as the distribution mean.
Answer: False
Difficulty: Easy
Goal: 3
18. A percentile can be a decile, but a decile can