Question 1

What is meant by a representative sample?

Accepted Answer

a sample that exhibits characteristics typical of those possessed by the population of interest

Question 2

What is meant by selection bias?

Accepted Answer

Selection bias is when a subset of the experimental units in the population is
excluded so that these units have no possibility of being selected in the sample.

Question 3

Parking at a university has become a problem. University administrators are interested in determining the average time it takes a student to find a parking spot. An administrator inconspicuously followed 140 students and recorded how long it took each of them to find a parking spot. Identify the population, sample, and variable of interest to the administrators.

Accepted Answer

The population of interest are all students at the university who park. The sample is the parking times of the 140 students that were collected by the university administrator. The variable of interest to the administrators is the parking time
variable.

Question 4

From past figures, it is predicted that 14% of the registered voters will vote in the March primary. Does this statement describe descriptive or inferential statistics?

Accepted Answer

A)  Descriptive statistics 
B)  Inferential statistics 
A)  Descriptive statistics 
B)  Inferential statistics

Question 5

Gender is one variable of interest in a study of the effectiveness of a new medication. For data entry purposes, the researcher conducting the study assigns 1 for Male and 2 for female. Is the gender data quantitative or qualitative?

Accepted Answer

Qualitative; The numbers are a

Question 6

A recent report stated "Based on a sample of 170 truck drivers, there is evidence to indicate that, on average, independent truck drivers earn more than company-hired truck drivers." Does this statement describe descriptive or inferential statistics?

Accepted Answer

A)  Descriptive statistics 
B)  Inferential statistics 
A)  Descriptive statistics 
B)  Inferential statistics

Question 7

A personnel director studied the eating habits of a company's employees. The director noted whether employees brought their own lunch to work, ate at the company cafeteria, or went out to eat lunch. This type of data collection would best be considered as a(n) __________.

Accepted Answer

A)  designed experiment 
B)  observational study 
A)  designed experiment 
B)  observational study

Question 8

Because of the possible legal consequences, many people in a sample of the U.S. population chose not to participate in a survey regarding illegal drug use. What type of problem has occurred?

Accepted Answer

A)  selection bias 
B)  nonresponse bias 
C)  measurement error 
A)  selection bias 
B)  nonresponse bias 
C)  measurement error

Question 9

As part of an economics class project, students were asked to randomly select 500 New York Stock Exchange (NYSE) stocks from the Wall Street Journal. As part of the project, students were asked to summarize the current prices (also referred to as the closing price of the stock for a particular trading date) of the collected stocks using graphical and numerical techniques. Identify the experimental unit of interest for this study.

Accepted Answer

A)  a single stock traded on the NYSE 
B)  the 500 NYSE stocks that current prices were collected from 
C)  the current price (or closing price) of a NYSE stock 
D)  the entire set of stocks that are traded on the NYSE 
A)  a single stock traded on the NYSE 
B)  the 500 NYSE stocks that current prices were collected from 
C)  the current price (or closing price) of a NYSE stock 
D)  the entire set of stocks that are traded on the NYSE

Question 10

The way in which an interviewer asks a question about political party affiliation causes respondents to answer that they have no affiliation when they actually do. What type of problem has occurred?

Accepted Answer

A)  selection bias 
B)  nonresponse bias 
C)  measurement error 
A)  selection bias 
B)  nonresponse bias 
C)  measurement error

Question 11

A variable is a characteristic or property of a population.

Accepted Answer

A) True 
 B)False

Question 12

Which data about paintings would not be qualitative?

Accepted Answer

A)  the artist 
B)  the value 
C)  the style 
D)  the theme 
A)  the artist 
B)  the value 
C)  the style 
D)  the theme

Question 13

As part of an economics class project, students were asked to randomly select 500 New York Stock Exchange (NYSE) stocks from the Wall Street Journal. As part of the project, students were asked to summarize the current prices (also referred to as the closing price of the stock for a particular trading date) of the collected stocks using graphical and numerical techniques. Identify the sample of interest for this study.

Accepted Answer

A)  a single stock traded on the NYSE 
B)  the current price (or closing price) of a NYSE stock 
C)  the entire set of stocks that are traded on the NYSE 
D)  the 500 NYSE stocks that current prices were collected from 
A)  a single stock traded on the NYSE 
B)  the current price (or closing price) of a NYSE stock 
C)  the entire set of stocks that are traded on the NYSE 
D)  the 500 NYSE stocks that current prices were collected from

Question 14

Three female students and two male students are to be chosen from a group of 30 female students and 20 male students. Does this sample of five students satisfy the conditions to be a random sample of the 50 students in the group? Explain.

Accepted Answer

No; not every sample of 5 stud

Question 15

As part of an economics class project, students were asked to randomly select 500 New York Stock Exchange (NYSE) stocks from the Wall Street Journal. As part of the project, students were asked to
Summarize the current prices (also referred to as the closing price of the stock for a particular
Trading date) of the collected stocks using graphical and numerical techniques. Identify the data
Collection method used in this study.

Accepted Answer

A)  data from a designed experiment 
B)  data collected observationally 
C)  data from a published source 
A)  data from a designed experiment 
B)  data collected observationally 
C)  data from a published source

Question 16

A study attempted to estimate the proportion of Florida residents who were willing to spend more tax dollars on protecting the Florida beaches from environmental disasters. Twenty-five hundred florida residents were surveyed.Which of the following describes the variable of interest in the
Study?

Accepted Answer

A)  the 2500 Florida residents surveyed 
B)  the response to the question, "Are you willing to spend more tax dollars on protecting the Florida beaches from environmental disasters?" 
C)  the response to the question "Do you live along the beach?" 
D)  the response to the question "Do you use the beach?" 
A)  the 2500 Florida residents surveyed 
B)  the response to the question, "Are you willing to spend more tax dollars on protecting the Florida beaches from environmental disasters?" 
C)  the response to the question "Do you live along the beach?" 
D)  the response to the question "Do you use the beach?"

Question 17

A high school guidance counselor analyzed data from a sample of 300 community colleges
throughout the United States. One of his goals was to estimate the annual tuition costs of community colleges in the United States. Describe the population and variable of interest to the guidance counselor.

Accepted Answer

The population of interest to

Question 18

The average age of the students in a statistics class is 22 years. Does this statement describe descriptive or inferential statistics?

Accepted Answer

A)  Descriptive statistics 
B)  Inferential statistics 
A)  Descriptive statistics 
B)  Inferential statistics

Question 19

Parking at a large university has become a very big problem. University administrators are interested in determining the average parking time (e.g. the time it takes a student to find a parking spot) of its students. An administrator inconspicuously followed 250 students and carefully recorded their parking times. Identify the population of interest to the university administration.

Accepted Answer

A)  the entire set of students that park at the university 
B)  a single student that parks at the university 
C)  the 250 students that data was collected from 
D)  the parking time, defined to be the amount of time the student spent finding a parking spot 
A)  the entire set of students that park at the university 
B)  a single student that parks at the university 
C)  the 250 students that data was collected from 
D)  the parking time, defined to be the amount of time the student spent finding a parking spot

Question 20

As part of an economics class project, students were asked to randomly select 500 New York Stock Exchange (NYSE) stocks from the Wall Street Journal. As part of the project, students were asked to summarize the current prices (also referred to as the closing price of the stock for a particular trading date) of the collected stocks using graphical and numerical techniques. Identify the population of interest for this study.

Accepted Answer

A)  the entire set of stocks that are traded on the NYSE 
B)  a single stock traded on the NYSE 
C)  the current price (or closing price) of a NYSE stock 
D)  the 500 NYSE stocks that current prices were collected from 
A)  the entire set of stocks that are traded on the NYSE 
B)  a single stock traded on the NYSE 
C)  the current price (or closing price) of a NYSE stock 
D)  the 500 NYSE stocks that current prices were collected from

What is meant by a representative sample?

What is meant by selection bias?

From past figures, it is predicted that 14% of the registered voters will vote in the March primary. Does this statement describe descriptive or inferential statistics?

Gender is one variable of interest in a study of the effectiveness of a new medication. For data entry purposes, the researcher conducting the study assigns 1 for Male and 2 for female. Is the gender data quantitative or qualitative?

A recent report stated "Based on a sample of 170 truck drivers, there is evidence to indicate that, on average, independent truck drivers earn more than company-hired truck drivers." Does this statement describe descriptive or inferential statistics?

A personnel director studied the eating habits of a company's employees. The director noted whether employees brought their own lunch to work, ate at the company cafeteria, or went out to eat lunch. This type of data collection would best be considered as a(n) __________.

Because of the possible legal consequences, many people in a sample of the U.S. population chose not to participate in a survey regarding illegal drug use. What type of problem has occurred?

The way in which an interviewer asks a question about political party affiliation causes respondents to answer that they have no affiliation when they actually do. What type of problem has occurred?

A variable is a characteristic or property of a population.

Which data about paintings would not be qualitative?

Three female students and two male students are to be chosen from a group of 30 female students and 20 male students. Does this sample of five students satisfy the conditions to be a random sample of the 50 students in the group? Explain.

A study attempted to estimate the proportion of Florida residents who were willing to spend more tax dollars on protecting the Florida beaches from environmental disasters. Twenty-five hundred florida residents were surveyed.Which of the following describes the variable of interest in the Study?

A high school guidance counselor analyzed data from a sample of 300 community colleges throughout the United States. One of his goals was to estimate the annual tuition costs of community colleges in the United States. Describe the population and variable of interest to the guidance counselor.

The average age of the students in a statistics class is 22 years. Does this statement describe descriptive or inferential statistics?

Methods for Describing Sets of Data

Probability

Random Variables and Probability Distributions

Sampling Distributions

Inferences Based on a Single Sample: Estimation With Confidence Intervals

Inferences Based on a Single Sample: 355 Tests of Hypotheses

Inferences Based on Two Samples: Confidence Intervals and Tests of Hypotheses

Design of Experiments and Analysis of Variance

Categorical Data Analysis

Simple Linear Regression

Multiple Regression and Model Building

Methods for Quality Improvement: Statistical Process Control Available on CD

Time Series: Descriptive Analyses, Models, and Forecasting Available on CD

Nonparametric Statistics Available on CD

Filters

Exam 1: Statistics, Data, and Statistical Thinking

What is meant by a representative sample?

What is meant by selection bias?

From past figures, it is predicted that 14% of the registered voters will vote in the March primary. Does this statement describe descriptive or inferential statistics?

Gender is one variable of interest in a study of the effectiveness of a new medication. For data entry purposes, the researcher conducting the study assigns 1 for Male and 2 for female. Is the gender data quantitative or qualitative?

A recent report stated "Based on a sample of 170 truck drivers, there is evidence to indicate that, on average, independent truck drivers earn more than company-hired truck drivers." Does this statement describe descriptive or inferential statistics?

A personnel director studied the eating habits of a company's employees. The director noted whether employees brought their own lunch to work, ate at the company cafeteria, or went out to eat lunch. This type of data collection would best be considered as a(n) __________.

Because of the possible legal consequences, many people in a sample of the U.S. population chose not to participate in a survey regarding illegal drug use. What type of problem has occurred?

The way in which an interviewer asks a question about political party affiliation causes respondents to answer that they have no affiliation when they actually do. What type of problem has occurred?

A variable is a characteristic or property of a population.

Which data about paintings would not be qualitative?

Three female students and two male students are to be chosen from a group of 30 female students and 20 male students. Does this sample of five students satisfy the conditions to be a random sample of the 50 students in the group? Explain.

A study attempted to estimate the proportion of Florida residents who were willing to spend more tax dollars on protecting the Florida beaches from environmental disasters. Twenty-five hundred florida residents were surveyed.Which of the following describes the variable of interest in the Study?

A high school guidance counselor analyzed data from a sample of 300 community colleges throughout the United States. One of his goals was to estimate the annual tuition costs of community colleges in the United States. Describe the population and variable of interest to the guidance counselor.

The average age of the students in a statistics class is 22 years. Does this statement describe descriptive or inferential statistics?

Methods for Describing Sets of Data

Probability

Random Variables and Probability Distributions

Sampling Distributions

Inferences Based on a Single Sample: Estimation With Confidence Intervals

Inferences Based on a Single Sample: 355 Tests of Hypotheses

Inferences Based on Two Samples: Confidence Intervals and Tests of Hypotheses

Design of Experiments and Analysis of Variance

Categorical Data Analysis

Simple Linear Regression

Multiple Regression and Model Building

Methods for Quality Improvement: Statistical Process Control Available on CD

Time Series: Descriptive Analyses, Models, and Forecasting Available on CD

Nonparametric Statistics Available on CD

Filters