9
17.0
71
married
oil, commodities
Koch, David
9
17.0
67
married
oil, commodities
a.
How many elements are in the above data set?
b.
How many variables are in this data set?
c.
How many observations are in this data set?
d.
Which variables are categorical and which are quantitative?
e.
What measurement scale is used for each variable?
ANS:
a.
10
b.
5
c.
10
d.
Worth and Age are quantitative
Ranking, Marital Status, and Source are categorical
e.
Ranking: ordinal
Worth: ratio
Age: ratio
Marital Status: nominal
Source: nominal
PTS: 1 TOP: Descriptive Statistics
11. The following national weather report gives the temperatures and weather conditions on the previous day in cities across the nation.
City
Hi
Lo
Condition
Albany, N.Y.
88
60
cloudy
Chicago
92
64
clear
Dallas-Ft.Worth
89
72
cloudy
Denver
75
54
clear
Hartford
88
61
cloudy
Honolulu
86
70
clear
Kansas City
93
74
clear
Los Angeles
80
62
cloudy
Nashville
94
72
rain
New York City
90
69
rain
Philadelphia
90
67
rain
a.
How many elements are in this data set?
b.
How many variables are in this data set?
c.
How many observations are there in the above data set?
d.
Which variables are categorical and which are quantitative?
e.
What measurement scale is used for temperature and weather conditions?
ANS:
a.
11
b.
3
c.
11
d.
Temperature is quantitative
Weather Condition is categorical
e.
Temperature (Hi and Lo): interval
Weather Condition: nominal
PTS: 1 TOP: Descriptive Statistics
12. The following table shows the age distribution of a sample of 180 students at a local college.
AGE DISTRIBUTION OF
180 STUDENTS AT A LOCAL COLLEGE
Age of Students
Number of Students
15 - 19
36
20 - 24
44
25 - 29
60
30 - 34
38
35 - 39
2
Total
180
a.
Of the students in the sample, what percentage is younger than 20 years of age?
b.
What percentage is at least 30 years of age?
c.
Based on this sample, what percentage of the students at the college do you estimate to be younger than 25 years of age?
ANS:
a.
20%
b.
22.22%
c.
44.44%
PTS: 1 TOP: Descriptive Statistics
13. The highway patrol is interested in determining the average speed of automobiles traveling on I-75 between Chattanooga and Atlanta. To accomplish this task, the speed of every tenth car passing a particular point on I-75 is recorded.
a.
What is the population for this study?
b.
What constitutes the sample?
c.
Is speed a categorical or a quantitative variable?
d.
What type of measurement scale is used?
ANS:
a.
All the automobiles on I-75
b.
All the tenth cars
c.
quantitative
d.
ratio
PTS: 1 TOP: Descriptive Statistics