STATS 2018 FINAL EXAM QUESTIONS WITH ACCURATE
ANSWERS.
What is a population?
What is a sample?
What is the difference between a population and a sample? - accurate
answers-A population is the entire group of entities of interest to a researcher.
A sample is a portion of the entities of interest that the researcher uses to
gather data.
A sample is only a part of a complete population.
What is a sample statistic?
What is a population parameter?
What is the difference between a sample statistic and a population parameter?
- accurate answers-A sample statistic is a numerical value describing some
attribute of a sample
A population parameter is a numerical value describing some attribute of a
population
A population parameter is frequently impractical or impossible to find for
large populations, however a sample statistic is often easier to find and
provides a reasonable approximation to the population parameter
Decide whether the statement below makes sense or does not make sense.
Explain.
A professor conducted a statistical study in which he was unable to measure
any sample statistics, but he succeeded in determining the population
parameters with a very small margin of error. - accurate answers-The
statement does not make sense, because population parameters are typically
inferred from sample statistics. When population parameters are known,
sample statistics are not needed and the concept of "margin of error" does not
apply.
In a poll, 1,005 adults in a country were asked whether they favor or oppose
the use of "federal tax dollars to fund medical research using stem cells
obtained from human embryos." Among the respondents, 47% said that they
were in favor. Describe the statistical study.
What is the population in the given problem?
Identify the sample for the given problem.
, What is the population parameter in the given study? Identify the sample
statistic. - accurate answers--All adults in the country
-The 1,005 adults selected
-The percentage of all adults in the country who say that they are in favor
-47%
In a test of the effectiveness of garlic for lowering cholesterol, 50 adult men
were treated with garlic in a processed tablet form. Cholesterol levels were
measured before and after the treatment. The changes in their levels of LDL
cholesterol (in mg/dL) have an average (mean) of 4.2. Identify the sample, the
population, the sample statistic, and the population parameter in this study.
What is the population in the given problem?
Identify the sample for the given problem.
What is the population parameter in the given study? Identify the sample
statistic. - accurate answers--the 50 adult men in the study
-all adult men
-the average change in the levels of LDL cholesterol (in mg/dL), 4.2, of the
adult men in the study after receiving the garlic treatment
-the average change in the levels of LDL cholesterol (in mg/dL) of all adult
men after receiving the garlic treatment
In a poll, 1,001 adults in a certain country were asked whether they favor or
oppose the use of "federal tax dollars to fund medical research using stem
cells obtained from human embryos." Based on the poll results, it is estimated
that 49% of adults are in favor, with a margin of error of 3 percentage points.
Use the given statistic and margin of error to identify the range of values
(confidence interval) likely to contain the true value of the population
parameter. - accurate answers-The range of values likely to contain the
population parameter is from
46% to 52%.
A researcher wants to determine the percentage given below. Describe how
the researcher should apply the five basic steps in a statistical study. (Assume
that all the people in the poll answered truthfully.)
the percentage of volunteers that volunteer over 10 hours per week
Determine how to apply the first-fifth basic step in a statistical study in this
situation. - accurate answers--The sample statistic of interest is the
percentage of volunteers that volunteer over 10 hours per week in the sample.
ANSWERS.
What is a population?
What is a sample?
What is the difference between a population and a sample? - accurate
answers-A population is the entire group of entities of interest to a researcher.
A sample is a portion of the entities of interest that the researcher uses to
gather data.
A sample is only a part of a complete population.
What is a sample statistic?
What is a population parameter?
What is the difference between a sample statistic and a population parameter?
- accurate answers-A sample statistic is a numerical value describing some
attribute of a sample
A population parameter is a numerical value describing some attribute of a
population
A population parameter is frequently impractical or impossible to find for
large populations, however a sample statistic is often easier to find and
provides a reasonable approximation to the population parameter
Decide whether the statement below makes sense or does not make sense.
Explain.
A professor conducted a statistical study in which he was unable to measure
any sample statistics, but he succeeded in determining the population
parameters with a very small margin of error. - accurate answers-The
statement does not make sense, because population parameters are typically
inferred from sample statistics. When population parameters are known,
sample statistics are not needed and the concept of "margin of error" does not
apply.
In a poll, 1,005 adults in a country were asked whether they favor or oppose
the use of "federal tax dollars to fund medical research using stem cells
obtained from human embryos." Among the respondents, 47% said that they
were in favor. Describe the statistical study.
What is the population in the given problem?
Identify the sample for the given problem.
, What is the population parameter in the given study? Identify the sample
statistic. - accurate answers--All adults in the country
-The 1,005 adults selected
-The percentage of all adults in the country who say that they are in favor
-47%
In a test of the effectiveness of garlic for lowering cholesterol, 50 adult men
were treated with garlic in a processed tablet form. Cholesterol levels were
measured before and after the treatment. The changes in their levels of LDL
cholesterol (in mg/dL) have an average (mean) of 4.2. Identify the sample, the
population, the sample statistic, and the population parameter in this study.
What is the population in the given problem?
Identify the sample for the given problem.
What is the population parameter in the given study? Identify the sample
statistic. - accurate answers--the 50 adult men in the study
-all adult men
-the average change in the levels of LDL cholesterol (in mg/dL), 4.2, of the
adult men in the study after receiving the garlic treatment
-the average change in the levels of LDL cholesterol (in mg/dL) of all adult
men after receiving the garlic treatment
In a poll, 1,001 adults in a certain country were asked whether they favor or
oppose the use of "federal tax dollars to fund medical research using stem
cells obtained from human embryos." Based on the poll results, it is estimated
that 49% of adults are in favor, with a margin of error of 3 percentage points.
Use the given statistic and margin of error to identify the range of values
(confidence interval) likely to contain the true value of the population
parameter. - accurate answers-The range of values likely to contain the
population parameter is from
46% to 52%.
A researcher wants to determine the percentage given below. Describe how
the researcher should apply the five basic steps in a statistical study. (Assume
that all the people in the poll answered truthfully.)
the percentage of volunteers that volunteer over 10 hours per week
Determine how to apply the first-fifth basic step in a statistical study in this
situation. - accurate answers--The sample statistic of interest is the
percentage of volunteers that volunteer over 10 hours per week in the sample.
