Test 1

Question 1

_____ analytics encompasses the set of analytical techniques that describe what has happened in the past.

Answer 1

Descriptive

Question 2

_____ analytics is the set of analytical techniques that yield a course of action.

Answer 2

Prescriptive

Question 3

All data collected in a study are referred to as the _____ _____.

Answer 3

Data Set

Question 4

Categorical data use either the ______ or ______ scale of measurement.

Answer 4

Nominal, Ordinal

Question 5

The major applications of data mining have been made by companies with a strong _____ focus.

Answer 5

Retail/Consumer

Question 6

Quantitative data is always _____.

Answer 6

numeric

Question 7

Quantitative data that measure “how many” are ________; quantitative data that measure “how much” are ________.

Answer 7

discrete, continuous

Question 8

Data collected at the same, or approximately the same, point in time are _____ data.

Answer 8

cross sectional

Question 9

The term data warehousing is used to refer to the process of doing all of the following, except _____ the data.

Answer 9

mining

Question 10

Data collected over several time periods are _____ _____ data.

Answer 10

time series

Question 11

The term _____ is used to refer to the process of capturing, storing, and maintaining data.

Answer 11

data warehousing

Question 12

Statistical studies in which researchers control variables of interest are _____ studies.

Answer 12

experimental

Question 13

Statistical studies in which researchers do not control variables of interest are _____.

Answer 13

observational

Question 14

In a post office, the mailboxes are numbered from 1 to 5,000. These numbers represent _____ data.

Answer 14

categorical

Question 15

The summaries of data, which may be tabular, graphical, or numerical, are referred to as _____ _____.

Answer 15

descriptive analytics

Question 16

A portion of the population selected to represent the population is called _____.

Answer 16

a sample

Question 17

The collection of all elements of interest in a study is _____.

Answer 17

population

Question 18

Which of the following is an example of categorical data?

Answer 18

social security number

Question 19

A statistics professor asked students in a class their ages. Based on this information, the professor states that the average age of students in the university is 21 years. This is an example of _____ _____.

Answer 19

statistical inference

Question 20

When the data have the properties of ordinal data and the interval between observations is expressed in terms of a fixed unit of measure, the variable has which scale of measurement?

Answer 20

interval

Question 21

When the data have the properties of interval data and the multiplication or division of two values is meaningful, the variable has which scale of measurement?

Answer 21

ratio

Question 22

Facts and figures collected, analyzed, and summarized for presentation and interpretation are called _____.

Answer 22

data

Question 23

Categorical data may be either _____ or ____.

Answer 23

may be either numeric or nonnumeric

Question 24

When the data are labels or names used to identify an attribute of the elements, the variable has which scale of measurement?

Answer 24

nominal

Question 25

Arithmetic operations are inappropriate for _____ data.

Answer 25

categorical

Question 26

Dr. Kurt Thearling, a leading practitioner in the field, defines data mining as “the _____ extraction of _____ information from databases."

Answer 26

automated, predictive

Question 27

The most common type of observational study is a(n) _____.

Answer 27

a survey

Question 28

_____ is the process of using procedures from statistics and computer science to extract useful information from extremely large databases.

Answer 28

data mining

Question 29

In a questionnaire, respondents are asked to record their age in years. Age is an example of a _____ _____.

Answer 29

quantitative variable

Question 30

When the data are labels or names used to identify an attribute of the elements and the rank of the data is meaningful, the variable has which scale of measurement?

Answer 30

Nominal

Question 31

Statistical inference is the process of _____.

Answer 31

drawing inferences about the population based on the information taken from the sample

Question 32

Income is an example of _____ data.

Answer 32

quantitative

Question 33

A mean computed in such a way that each data value is given a weight reflecting its importance is referred to as a(n) _____.

Answer 33

weighted mean

Question 34

A numerical measure computed from a sample, such as sample mean, is known as a _____ _____.

Answer 34

sample statistic

Question 35

A numerical measure of linear association between two variables is the _____.

Answer 35

covariance

Question 36

After the data have been arranged from smallest value to largest value, the value in the middle is called the _____.

Answer 36

median

Question 37

An important measure of location for categorical data is the _____.

Answer 37

mode

Question 38

If r = 0.48 for data set A and r = –0.48 for data set B, which of the following is true?

Answer 38

The two data sets have the same level of correlation.

Question 39

The correlation coefficient is _____.

Answer 39

a statistical measure of the strength of a linear relationship between two variables. Its values can range from -1 to 1.

Question 40

The sample variance is _____.

Answer 40

a measure of the “average” of the squared deviations from the sample mean

Question 41

A magician holds a standard deck of cards and draws one card. The probability of drawing the ace of diamonds is 1/52. What method of assigning probabilities was used?

Answer 41

classical method

Question 42

A method of assigning probabilities based upon judgment is referred to as the _____ method.

Answer 42

subjective

Question 43

A sample point refers to a(n) _____.

Answer 43

individual outcome of an experiment

Question 44

A(n) __________ is a collection of sample points

Answer 44

event

Question 45

An element of the sample space is a(n) _____.

Answer 45

sample point

Question 46

Any process that generates well-defined outcomes is _____.

Answer 46

experiment

Question 47

Bayes' theorem is used to compute _____.

Answer 47

posterior probabilities