Question 1

Which should not be regarded as a continuous random variable?

Accepted Answer

A)  Tonnage carried by a randomly chosen oil tanker at sea 
B)  Wind velocity at 7 o'clock this morning 
C)  Number of personal fouls by the Miami Heat in a game 
D)  Length of time to play a Wimbledon tennis match 
A)  Tonnage carried by a randomly chosen oil tanker at sea 
B)  Wind velocity at 7 o'clock this morning 
C)  Number of personal fouls by the Miami Heat in a game 
D)  Length of time to play a Wimbledon tennis match

Question 2

Sampling error is avoidable by choosing the sample scientifically.

Accepted Answer

A) True 
 B)False

Question 3

When the population is large,a sample estimate is usually preferable to a census.

Accepted Answer

A) True 
 B)False

Question 4

Which is least likely to be regarded as a ratio variable?

Accepted Answer

A)  A critic's rating of a restaurant on a 1 to 4 scale 
B)  Automobile exhaust emission of nitrogen dioxide (milligrams per mile) 
C)  Number of customer complaints per day at a cable TV company office 
D)  Cost of an e-Bay purchase 
A)  A critic's rating of a restaurant on a 1 to 4 scale 
B)  Automobile exhaust emission of nitrogen dioxide (milligrams per mile) 
C)  Number of customer complaints per day at a cable TV company office 
D)  Cost of an e-Bay purchase

Question 5

When we are choosing a random sample and we do not place chosen units back into the population,we are:

Accepted Answer

A)  sampling with replacement. 
B)  sampling without replacement. 
C)  using a systematic sample. 
D)  using a voluntary sample. 
A)  sampling with replacement. 
B)  sampling without replacement. 
C)  using a systematic sample. 
D)  using a voluntary sample.

Question 6

A sampling technique used when groups are defined by their geographical location is:

Accepted Answer

A)  cluster sampling. 
B)  convenience sampling. 
C)  judgment sampling. 
D)  random sampling. 
A)  cluster sampling. 
B)  convenience sampling. 
C)  judgment sampling. 
D)  random sampling.

Question 7

Sampling bias can best be reduced by:

Accepted Answer

A)  using appropriate data coding. 
B)  having a computer tabulate the results. 
C)  utilizing random sampling. 
D)  taking a judgment sample. 
A)  using appropriate data coding. 
B)  having a computer tabulate the results. 
C)  utilizing random sampling. 
D)  taking a judgment sample.

Question 8

Which of the following is numerical data?

Accepted Answer

A)  Your gender 
B)  The brand of cell phone you own 
C)  Whether you have an American Express card 
D)  The fuel economy (MPG)of your car 
A)  Your gender 
B)  The brand of cell phone you own 
C)  Whether you have an American Express card 
D)  The fuel economy (MPG)of your car

Question 9

Temperature measured in degrees Fahrenheit is an example of interval data.

Accepted Answer

A) True 
 B)False

Question 10

Nominal data refer to data that can be ordered in a natural way.

Accepted Answer

A) True 
 B)False

Question 11

Judgment sampling is sometimes preferred over random sampling,for example,when:

Accepted Answer

A)  the desired sample size is much larger than the population. 
B)  the sampling budget is large and the population is conveniently located. 
C)  time is short and the sampling budget is limited. 
D)  the population is readily accessible and sampling is nondestructive. 
A)  the desired sample size is much larger than the population. 
B)  the sampling budget is large and the population is conveniently located. 
C)  time is short and the sampling budget is limited. 
D)  the population is readily accessible and sampling is nondestructive.

Question 12

The closing price of a stock is an example of ratio data.

Accepted Answer

A) True 
 B)False

Question 13

Using a sample to make generalizations about an aspect of a population is called:

Accepted Answer

A)  data mining. 
B)  descriptive statistics. 
C)  random sampling. 
D)  statistical inference. 
A)  data mining. 
B)  descriptive statistics. 
C)  random sampling. 
D)  statistical inference.

Question 14

Telephone surveys often have a low response rate and fail to reach the desired population.

Accepted Answer

A) True 
 B)False

Question 15

An advantage of a systematic sample is that no list of enumerated data items is required.

Accepted Answer

A) True 
 B)False

Question 16

A problem with nonrandom sampling is that:

Accepted Answer

A)  larger samples need to be taken to reduce the sampling error inherent in this approach. 
B)  not every item in the population has the same chance of being selected,as it should. 
C)  it is usually more expensive than random sampling. 
D)  it generally provides lower response rates than random sampling. 
A)  larger samples need to be taken to reduce the sampling error inherent in this approach. 
B)  not every item in the population has the same chance of being selected,as it should. 
C)  it is usually more expensive than random sampling. 
D)  it generally provides lower response rates than random sampling.

Question 17

An observation in a data set would refer to:

Accepted Answer

A)  only a variable whose value is recorded by visual inspection. 
B)  a data item whose value is numerical (as opposed to categorical). 
C)  a single row that contains one or more observed variables. 
D)  the values of all the variables in the entire data set. 
A)  only a variable whose value is recorded by visual inspection. 
B)  a data item whose value is numerical (as opposed to categorical). 
C)  a single row that contains one or more observed variables. 
D)  the values of all the variables in the entire data set.

Question 18

A sampling frame is used to identify the target population in a statistical study.

Accepted Answer

A) True 
 B)False

Question 19

Measurements from a sample are called:

Accepted Answer

A)  statistics. 
B)  inferences. 
C)  parameters. 
D)  variables. 
A)  statistics. 
B)  inferences. 
C)  parameters. 
D)  variables.

Question 20

An advantage of convenience samples is that:

Accepted Answer

A)  the required sample size is easier to calculate. 
B)  sampling error can be reduced. 
C)  computation of statistics is easier. 
D)  they are often quicker and cheaper. 
A)  the required sample size is easier to calculate. 
B)  sampling error can be reduced. 
C)  computation of statistics is easier. 
D)  they are often quicker and cheaper.

Which should not be regarded as a continuous random variable?

Sampling error is avoidable by choosing the sample scientifically.

When the population is large,a sample estimate is usually preferable to a census.

Which is least likely to be regarded as a ratio variable?

When we are choosing a random sample and we do not place chosen units back into the population,we are:

A sampling technique used when groups are defined by their geographical location is:

Sampling bias can best be reduced by:

Which of the following is numerical data?

Temperature measured in degrees Fahrenheit is an example of interval data.

Nominal data refer to data that can be ordered in a natural way.

Judgment sampling is sometimes preferred over random sampling,for example,when:

The closing price of a stock is an example of ratio data.

Using a sample to make generalizations about an aspect of a population is called:

Telephone surveys often have a low response rate and fail to reach the desired population.

An advantage of a systematic sample is that no list of enumerated data items is required.

A problem with nonrandom sampling is that:

An observation in a data set would refer to:

A sampling frame is used to identify the target population in a statistical study.

Measurements from a sample are called:

An advantage of convenience samples is that:

Overview of Statistics

Describing Data Visually

Descriptive Statistics

Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions and Estimation

One-Sample Hypothesis Tests

Two-Sample Hypothesis Tests

Analysis of Variance

Simple Regression

Multiple Regression

Time-Series Analysis

Chi-Square Tests

Nonparametric Tests

Quality Management

Filters

Exam 2: Data Collection

Which should not be regarded as a continuous random variable?

Sampling error is avoidable by choosing the sample scientifically.

When the population is large,a sample estimate is usually preferable to a census.

Which is least likely to be regarded as a ratio variable?

When we are choosing a random sample and we do not place chosen units back into the population,we are:

A sampling technique used when groups are defined by their geographical location is:

Sampling bias can best be reduced by:

Which of the following is numerical data?

Temperature measured in degrees Fahrenheit is an example of interval data.

Nominal data refer to data that can be ordered in a natural way.

Judgment sampling is sometimes preferred over random sampling,for example,when:

The closing price of a stock is an example of ratio data.

Using a sample to make generalizations about an aspect of a population is called:

Telephone surveys often have a low response rate and fail to reach the desired population.

An advantage of a systematic sample is that no list of enumerated data items is required.

A problem with nonrandom sampling is that:

An observation in a data set would refer to:

A sampling frame is used to identify the target population in a statistical study.

Measurements from a sample are called:

An advantage of convenience samples is that:

Overview of Statistics

Describing Data Visually

Descriptive Statistics

Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions and Estimation

One-Sample Hypothesis Tests

Two-Sample Hypothesis Tests

Analysis of Variance

Simple Regression

Multiple Regression

Time-Series Analysis

Chi-Square Tests

Nonparametric Tests

Quality Management

Filters