CHAPTER ONE HOMEWORK
True or False
The type of TV one owns is an example of an ordinal scaled variable.
Whether the university is private or public is an example of a nominal scaled variable.
Marital status is an example of a numerical variable.
Multiple choices
The process of using sample statistics to draw conclusions about true population parameters is called
statistical inference.
the scientific method.
descriptive statistics.
Those methods involving the collection, presentation, and characterization of a set of data in order to properly describe the various features of that set of data are called
statistical inference.
the scientific method.
descriptive statistics.
The universe or “totality of items or things” under consideration is called
a sample.
a population.
a parameter.
a statistic.
The portion of the universe that has been selected for analysis is called
a sample.
a frame.
a parameter.
a statistic.
A summary measure that is computed to describe a characteristic from only a sample of the population is called
a parameter.
a census.
a statistic.
the scientific method.
A summary measure that is computed to describe a characteristic of an entire population is called
a parameter.
a census.
a statistic.
the scientific method.
Which of the following is most likely a population as opposed to a sample?
respondents to a newspaper survey
the first 5 students completing an assignment
every third person to arrive at the bank
registered voters in a county
Which of the following is most likely a parameter as opposed to a statistic?
the average score of the first five students completing an assignment
the proportion of females registered to vote in a county
the average height of people randomly selected from a database
the proportion of trucks stopped yesterday that were cited for bad brakes
Most analysts focus on the cost of tuition as the way to measure the cost of a college education. But incidentals, such as textbook costs, are rarely considered. A researcher at Drummand University wishes to estimate the textbook costs of first-year students at Drummand. To do so, she monitored the textbook cost of 250 first-year students and found that their average textbook cost was $300 per semester. Identify the population of interest to the researcher.
all Drummand University students
all college students
all first-year Drummand University students
the 250 students that were monitored
Most analysts focus on the cost of tuition as the way to measure the cost of a college education. But incidentals, such as textbook costs, are rarely considered. A researcher at Drummand University wishes to estimate the textbook costs of first-year students at Drummand. To do so, she monitored the textbook cost of 250 first-year students and found that their average textbook cost was $300 per semester. Identify the variable of interest to the researcher
the textbook cost of first-year Drummand University students
the year in school of Drummand University students
the age of Drummand University students
the cost of incidental expenses of Drummand University students
Most analysts focus on the cost of tuition as the way to measure the cost of a college education. But incidentals, such as textbook costs, are rarely considered. A researcher at Drummand University wishes to estimate the textbook costs of first-year students at Drummand. To do so, she monitored the textbook cost of 250 first-year students and found that their average textbook cost was $300 per semester. Identify the sample in the study.
all Drummand University students
all college students
all first-year Drummand University students
the 250 students that were monitored
Which of the following is a discrete quantitative variable?
the Dow Jones Industrial average
the volume of water released from a dam
the distance you drove yesterday.
the number of employees of an insurance company
Which of the following is a continuous quantitative variable?
the color of a student’s eyes
the number of employees of an insurance company
the amount of milk produced by a cow in one 24-hour period
the number of gallons of milk sold at the local grocery store yesterday
The classification of student class designation (freshman, sophomore, junior, senior) is an example of
a categorical random variable.
a discrete random variable.
a continuous random variable.
a parameter.
Solve the following problems in separate sheets of paper.
According to a Harris Interactive survey of 502 senior human resource executives, 58% responded that referrals were one of the methods for finding the best candidates.
Describe the population for the Harris Interactive survey.
Is a response to the question “By which methods do you feel you find the best candidates?” categorical or numerical?
Fourteen percent of the senior human resources executives polled indicated that professional associations were one of the methods for finding the best candidates. Is this a parameter or a statistic?
A Wall Street Journal poll asked 2,150 adults in the United States a series of questions to find out their view on the U.S. economy.
What is the population of interest?
What is the sample?
Is a response to the question “How satisfied are you with the U.S. economy today with 1 = very satisfied, 2 = moderately satisfied, 3 = neutral, 4 = moderately dissatisfied and 5 = very dissatisfied?” a categorical or numerical?
Is a response to the question “How many people in your household are unemployed currently?” a discrete or continuous variable?
