Chapter 1 and 2 Statistics Exam Questions
And Answers
Homework 1.1 - ANS ...
The population is the
complete set of people or things being studied,
a population parameter is
a number that describes a characteristic of
thepopulation, a sample is the
set of people or things from which the data are obtained,
a sample statistic is
a number that describes a characteristic of
asample, and raw data are
the individual measurements collected. - ANS ...
One study of heart disease involved treating male physicians with daily doses of aspirin.
Because the study concluded that aspirin helps males avoid heartdisease, it follows that
females can also avoid heart disease by taking aspirin. - ANS The statement does not
make sense. Inferences about one population do not necessarily apply to a different population.
In apoll, 1,004 women
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 humanembryos." Among therespondents,
47% said that they were in favor. Describe the statistical study.
-Identify the sample for the given problem.
-What is the population parameter in the givenstudy?
-Identify the sample statistic. - ANS -Sample: 1,004 women selected
-Population Parameter: The percentage of all women in the country who say that they are in
favor
-Sample Statistic: 47%
In a test of the effectiveness of garlic for loweringcholesterol, 40 senior citizens
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 3.8. Identify thesample, thepopulation, the samplestatistic, and the
population parameter in this study. - ANS -Sample: the 40 senior citizens in the study
-Population: all senior citizens
-Sample Statistic: the average change in the levels of LDL cholesterol(in mg/dL), 3.8, of the
senior citizens in the study after receiving the garlic treatment.
-Population Parameter: the average change in the levels of LDL cholesterol(in mg/dL) of all
senior citizens after receiving the garlic treatment
In apoll, 1,003 men 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 humanembryos." Among
therespondents, 46% said that they were in favor. Describe the statistical study. - ANS
-Population: All men in the country
-Sample: 1,003 men selected
-Population Parameter: The percentage of all men
in the country who say that they are in favor
-Sample Statistic: 46%
Forty adult men in the United States are randomly selected and measured for their body mass
index(BMI). Based on thatsample, it is estimated that the average(mean) BMI for men is 25.0,
with a margin of error of 3.2.
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. - ANS -21.8 to 28.2
Add and Subtract 3.2 to get margin of error.
In a poll of 1265 adultsnationwide, asking whether they favor or oppose teachers and school
officials carrying guns inschool, 58% were opposed. The margin of error is 4 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. - ANS 54% to 62%
Based on a recent survey of adults in
60,000 households, a labor department reported an unemployment rate of 4.7%.
The margin of error was 0.1 percentage point. - ANS -Goal: To determine the percentage
of adults who are unemployed
-Population: Complete set of all adults
-Population Parameter: Percentage of all adults who are unemployed
-Sample: Sample of adults selected for the survey
-Raw data: Individual responses to question
-Sample Statistic: 4.7%
-MoE: 4.6% to 4.8%
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
answeredtruthfully.)
And Answers
Homework 1.1 - ANS ...
The population is the
complete set of people or things being studied,
a population parameter is
a number that describes a characteristic of
thepopulation, a sample is the
set of people or things from which the data are obtained,
a sample statistic is
a number that describes a characteristic of
asample, and raw data are
the individual measurements collected. - ANS ...
One study of heart disease involved treating male physicians with daily doses of aspirin.
Because the study concluded that aspirin helps males avoid heartdisease, it follows that
females can also avoid heart disease by taking aspirin. - ANS The statement does not
make sense. Inferences about one population do not necessarily apply to a different population.
In apoll, 1,004 women
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 humanembryos." Among therespondents,
47% said that they were in favor. Describe the statistical study.
-Identify the sample for the given problem.
-What is the population parameter in the givenstudy?
-Identify the sample statistic. - ANS -Sample: 1,004 women selected
-Population Parameter: The percentage of all women in the country who say that they are in
favor
-Sample Statistic: 47%
In a test of the effectiveness of garlic for loweringcholesterol, 40 senior citizens
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 3.8. Identify thesample, thepopulation, the samplestatistic, and the
population parameter in this study. - ANS -Sample: the 40 senior citizens in the study
-Population: all senior citizens
-Sample Statistic: the average change in the levels of LDL cholesterol(in mg/dL), 3.8, of the
senior citizens in the study after receiving the garlic treatment.
-Population Parameter: the average change in the levels of LDL cholesterol(in mg/dL) of all
senior citizens after receiving the garlic treatment
In apoll, 1,003 men 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 humanembryos." Among
therespondents, 46% said that they were in favor. Describe the statistical study. - ANS
-Population: All men in the country
-Sample: 1,003 men selected
-Population Parameter: The percentage of all men
in the country who say that they are in favor
-Sample Statistic: 46%
Forty adult men in the United States are randomly selected and measured for their body mass
index(BMI). Based on thatsample, it is estimated that the average(mean) BMI for men is 25.0,
with a margin of error of 3.2.
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. - ANS -21.8 to 28.2
Add and Subtract 3.2 to get margin of error.
In a poll of 1265 adultsnationwide, asking whether they favor or oppose teachers and school
officials carrying guns inschool, 58% were opposed. The margin of error is 4 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. - ANS 54% to 62%
Based on a recent survey of adults in
60,000 households, a labor department reported an unemployment rate of 4.7%.
The margin of error was 0.1 percentage point. - ANS -Goal: To determine the percentage
of adults who are unemployed
-Population: Complete set of all adults
-Population Parameter: Percentage of all adults who are unemployed
-Sample: Sample of adults selected for the survey
-Raw data: Individual responses to question
-Sample Statistic: 4.7%
-MoE: 4.6% to 4.8%
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
answeredtruthfully.)
