MATH 1080: Introduction to Statistics
Midterm/ 115 Qs with Certified Solutions.
Determine whether the sampling method described below appears to be sound or is flawed.
In a survey of 538 subjects, the following question was posted on a newspaper's website: "In
your view, are nuclear plants safe?" The survey subjects were Internet users who chose to
respond to the question posted on the electronic edition of the newspaper. - Answer: - It is
flawed because it is a voluntary response sample.
Which of the following is NOT a voluntary response sample? - Answer: - Quiz scores from a
college level statistics course are analyzed to determine student progress.
Determine whether the underlined number is a statistic or a parameter.
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,In a study of all 2669 students at a college, it is found that 25% own a computer - Answer: -
Parameter because the value is a numerical measurement describing a characteristic of a
population
State whether the data described below are discrete or continuous, and explain why.
The heights of trees in a forest - Answer: - The data are continuous because the data can take
on any value in an interval
State whether the data described below are discrete or continuous, and explain why.
The exact ages in hours of different cockroaches found in a certain city. - Answer: - The data are
continuous because the data can take on any value in an interval
Determine which of the four levels of measurement (nominal, ordinal, interval, ratio) is most
appropriate.
Makes of computers - Answer: - Nominal
Determine which of the four levels of measurement (nominal, ordinal, interval, ratio) is most
appropriate.
Flight numbers - Answer: The nominal level of measurement is most appropriate because the
data cannot be ordered.
which of the following is NOT a level of measurement?
Ratio
Nominal
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, Quantitative
Ordinal - Answer: - Quantitative
Determine whether the description corresponds to an observational study or an experiment.
Fifty patients with colon cancer are divided into two groups. One groups receives an
experimental drug to fight cancer, the other a placebo. After one year, the spread of the cancer
is measured. - Answer: - Experiment
Identify the type of sampling used (random, systematic, convenience, stratified, or cluster
sampling) in the situation described below.
A researcher selects every 585th social security number and surveys the corresponding person -
Answer: - Systematic sampling
Identify the type of sampling used (random, systematic, convenience, stratified, or cluster
sampling) in the situation described below.
In a poll conducted by a certain research center, 893 adults were called after their telephone
numbers were randomly generated by a computer and 37% were able to correctly identify the
president
Which type of sampling did the research center use. - Answer: - Random sampling
Identify the lower class limits, upper class limits, class width, class midpoints, and class
boundaries for the given frequency distribution. Also identify the number of individuals
included in the summary.
Age (yr) when award was won | Frequency
Page 3 of 28
Midterm/ 115 Qs with Certified Solutions.
Determine whether the sampling method described below appears to be sound or is flawed.
In a survey of 538 subjects, the following question was posted on a newspaper's website: "In
your view, are nuclear plants safe?" The survey subjects were Internet users who chose to
respond to the question posted on the electronic edition of the newspaper. - Answer: - It is
flawed because it is a voluntary response sample.
Which of the following is NOT a voluntary response sample? - Answer: - Quiz scores from a
college level statistics course are analyzed to determine student progress.
Determine whether the underlined number is a statistic or a parameter.
Page 1 of 28
,In a study of all 2669 students at a college, it is found that 25% own a computer - Answer: -
Parameter because the value is a numerical measurement describing a characteristic of a
population
State whether the data described below are discrete or continuous, and explain why.
The heights of trees in a forest - Answer: - The data are continuous because the data can take
on any value in an interval
State whether the data described below are discrete or continuous, and explain why.
The exact ages in hours of different cockroaches found in a certain city. - Answer: - The data are
continuous because the data can take on any value in an interval
Determine which of the four levels of measurement (nominal, ordinal, interval, ratio) is most
appropriate.
Makes of computers - Answer: - Nominal
Determine which of the four levels of measurement (nominal, ordinal, interval, ratio) is most
appropriate.
Flight numbers - Answer: The nominal level of measurement is most appropriate because the
data cannot be ordered.
which of the following is NOT a level of measurement?
Ratio
Nominal
Page 2 of 28
, Quantitative
Ordinal - Answer: - Quantitative
Determine whether the description corresponds to an observational study or an experiment.
Fifty patients with colon cancer are divided into two groups. One groups receives an
experimental drug to fight cancer, the other a placebo. After one year, the spread of the cancer
is measured. - Answer: - Experiment
Identify the type of sampling used (random, systematic, convenience, stratified, or cluster
sampling) in the situation described below.
A researcher selects every 585th social security number and surveys the corresponding person -
Answer: - Systematic sampling
Identify the type of sampling used (random, systematic, convenience, stratified, or cluster
sampling) in the situation described below.
In a poll conducted by a certain research center, 893 adults were called after their telephone
numbers were randomly generated by a computer and 37% were able to correctly identify the
president
Which type of sampling did the research center use. - Answer: - Random sampling
Identify the lower class limits, upper class limits, class width, class midpoints, and class
boundaries for the given frequency distribution. Also identify the number of individuals
included in the summary.
Age (yr) when award was won | Frequency
Page 3 of 28
