stats

Methods for developing useful decision-making information from large data bases is known as
data mining
The process of capturing, storing, and maintaining data is known as
data warehousing
The subject of data mining deals with
methods for developing useful decision-making information from large data bases
In a questionnaire, respondents are asked to mark their gender as male or female. Gender is an example of the
nominal scale
The nominal scale of measurement has the properties of the
None of these alternatives is correct.
The scale of measurement that is used to rank order the observation for a variable is called the
ordinal scale
Some hotels ask their guests to rate the hotel’s services as excellent, very good, good, and poor. This is an example of the
ordinal scale
The ordinal scale of measurement has the properties of the
nominal scale
The ratio scale of measurement has the properties of
the interval scale
Temperature is an example of a variable that uses
the interval scale
The interval scale of measurement has the properties of the
None of these alternatives is correct.
Arithmetic operations are inappropriate for
the nominal scale
Income is an example of a variable that uses the
ratio scale
Data obtained from a nominal scale
can be either numeric or nonnumeric
The scale of measurement that has an inherent zero value defined is the
ratio scale
Arithmetic operations are appropriate for
None of these alternatives is correct
Quantitative data refers to data obtained with a(n)
either interval or ratio scale
Data
are the raw material of statistics
The entities on which data are collected are
elements
The set of measurements collected for a particular element is (are) called
observations
A characteristic of interest for the elements is called a(n)
variable
All the data collected in a particular study are referred to as the
data set
Another name for “observations” is
cases
Quantitative data
are always numeric
In a questionnaire, respondents are asked to mark their gender as male or female. Gender is an example of a
categorical variable
The number of cases will always be the same as the number of
elements
Categorical data
may be either numeric or nonnumeric
Categorical data
are labels used to identify attributes of elements
Ordinary arithmetic operations are meaningful
only with quantitative data
Social security numbers consist of numeric values. Therefore, social security is an example of
a categorical variable
Temperature is an example of
a quantitative variable
For ease of data entry into a university database, 1 denotes that the student is an undergraduate and 2 indicates that the student is a graduate student. In this case data are
categorical
Arithmetic operations are inappropriate for
categorical data
Income is an example of
categorical data
Data collected at the same, or approximately the same, point in time are
crossectional data
Data collected over several time periods are
time series data
Statistical studies in which researchers do not control variables of interest are
observational studies
Statistical studies in which researchers control variables of interest are
experimental studies
The summaries of data, which may be tabular, graphical, or numerical, are referred to as
descriptive statistics
Statistical inference
is the process of drawing inferences about the population based on the information taken from the sample
The collection of all elements of interest in a particular study is
the sampling
A portion of the population selected to represent the population is called
a sample
In a sample of 800 students in a university, 240, or 30%, are Business majors. The 30% is an example of
descriptive statistics
In a sample of 400 students in a university, 80, or 20%, are Business majors. Based on the above information, the school’s paper reported that “20% of all the students at the university are Business majors.” This report is an example of
statistical inference
Five hundred residents of a city are polled to obtain information on voting intentions in an upcoming city election. The five hundred residents in this study is an example of a(n)
sample
A statistics professor asked students in a class their ages. On the basis of this information, the professor states that the average age of all the students in the university is 24 years. This is an example of
statistical inference
The owner of a factory regularly requests a graphical summary of all employees’ salaries. The graphical summary of salaries is an example of
descriptive statistics
The Department of Transportation of a city has noted that on the average there are 17 accidents per day. The average number of accidents is an example of
descriptive statistics
The process of analyzing sample data in order to draw conclusions about the characteristics of a population is called
statistical inference
In a post office, the mailboxes are numbered from 1 to 4,500. These numbers represent
categorical data
The average age in a sample of 190 students at City College is 22. As a result of this sample, it can be concluded that the average age of all the students at City College
could be larger, smaller, or equal to 22
Since a sample is a subset of the population, the sample mean
can be larger, smaller, or equal to the mean of the population
The scale of measurement that is simply a label for the purpose of identifying the attribute of an element is the
nominal scale
In a data set, the number of elements will always be the same as the number of
observations
Which of the following is not a scale of measurement?
primal
Which of the following is a scale of measurement?
ratio
Which of the following variables use the ratio scale of measurement?
nominal
Which of the following variables use the ratio scale of measurement?
income
The weight of a candy bar in ounces is an example of
quantitative data
The height of a building, measured in feet, is an example of
quantitative data
An interviewer has made an error in recording the data. This type of error is known as
a data acquisition error
Census refers to
a survey to collect data on the entire population
In experimental studies, the variable of interest
is controlled
In observational studies, the variable of interest
is not controlled
How many scales of measurement exist?
4
Which of the following can be classified as quantitative data?
interval and ratio
The sample size
is always smaller than the population size
A population is
the collection of all items of interest in a particular study
In a random sample of 200 items, 5 items were defective. An estimate of the percentage of defective items in the population is
2.5%
On a street, the houses are numbered from 300 to 450. The house numbers are examples of
categorical data
A survey to collect data on the entire population is
a census
In Excel, a worksheet that displays the data for the problem and shows the results of the analysis is
a value worksheet
In Excel, a worksheet that displays the formulas used to create the results is a
formula worksheet