Question 1

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

Accepted Answer

A)  a sample. 
B)  a population. 
C)  statistical inference. 
D)  descriptive statistics.

Question 2

In observational studies, the variable of interest

Accepted Answer

A)  is not controlled. 
B)  is controlled. 
C)  must be numerical. 
D)  cannot be numerical.

Question 3

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

Accepted Answer

A)  ​wholesale 
B)  ​manufacturing 
C)  consumer 
D)  ​research and development

Question 4

The owner of a factory regularly requests a graphical summary of all employees' salaries. The graphical summary of salaries is an example of _____ statistics.

Accepted Answer

A)  inferential 
B)  descriptive 
C)  experimental 
D)  observational

Question 5

The data measured on ordinal scale exhibits all the properties of data measured on

Accepted Answer

A)  ratio scale. 
B)  interval scale. 
C)  nominal scale. 
D)  nominal and interval scales.

Question 6

The Department of Transportation of a city has calculated that on the average there are 17 accidents per day. The average number of accidents is an example of

Accepted Answer

A)  descriptive statistics. 
B)  statistical inference. 
C)  a sample. 
D)  a population.

Question 7

The subject of data mining deals with

Accepted Answer

A)  methods for developing useful decision-making information from large data bases. 
B)  keeping data secure so that unauthorized individuals cannot access the data. 
C)  computational procedure for data analysis. 
D)  computing the average for data.

Question 8

The collection of all elements of interest in a study is

Accepted Answer

A)  the population. 
B)  the sample. 
C)  a survey. 
D)  a census.

Question 9

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

Accepted Answer

A)  prescriptive 
B)  predictive 
C)  descriptive 
D)  diagnostic

Question 10

In experimental studies, the variable of interest

Accepted Answer

A)  is not controlled. 
B)  is controlled. 
C)  must be numerical. 
D)  cannot be numerical.

Question 11

Five hundred residents of a city with a population of 240,495 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)

Accepted Answer

A)  census. 
B)  sample. 
C)  observation. 
D)  population.

Question 12

Data dash-board is an analytical technique that falls in the category of _____ analytics.

Accepted Answer

A)  prescriptive 
B)  predictive 
C)  descriptive 
D)  diagnostic

Question 13

​Which of the following is not an example of descriptive statistics?

Accepted Answer

A)  ​A histogram depicting the age distribution for 30 randomly selected students 
B)  ​An estimate of the number of Alaska residents who have visited Canada 
C)  ​A table summarizing the data collected in a sample of new-car buyers 
D)  ​The proportion of mailed-out questionnaires that were returned

Question 14

The measurement scale suitable for quantitative data is _____ scale.

Accepted Answer

A)  the ordinal 
B)  the nominal 
C)  either the interval or ratio 
D)  only the interval

Question 15

How many scales of measurement exist?

Accepted Answer

A)  2 
B)  4 
C)  6 
D)  8

Question 16

A portion selected to represent the whole is called a

Accepted Answer

A)  survey. 
B)  population. 
C)  census. 
D)  sample.

Question 17

Arithmetic operations provide meaningful results for variables that

Accepted Answer

A)  use any scale of measurement except nominal and ordinal. 
B)  appear as non-numerical values. 
C)  are quantitative. 
D)  have non-negative values.

Question 18

A restaurant asks their customers to fill out a questionnaire indicating whether their service was excellent, very good, good, or poor. The rating scale used is an example of the _____ scale.

Accepted Answer

A)  ordinal 
B)  ratio 
C)  nominal 
D)  interval

Question 19

Quantitative data

Accepted Answer

A)  are always non-numeric. 
B)  may be either numeric or non-numeric. 
C)  are always numeric. 
D)  are never numeric.

Question 20

All the data collected in a particular study are referred to as the

Accepted Answer

A)  sample. 
B)  variable. 
C)  data set. 
D)  population.

Exam 1: Data and Statistics