MATH225 Week 2 Quiz : comparing sampling methods
Question 1
A company has developed a wristband for monitoring blood sugar levels without requiring direct blood
samples. It is interested in demonstrating the accuracy of the device for governmental approval and has
decided to test the claim "The glucose level reported by the wristband is within 10% of a standard blood
test result." Which of the following data collection processes would be appropriate? Select only one
answer choice.
Select the correct answer below:
Choose a random sample of employees at lunchtime and measure their blood sugar using both the
wristband and a standard blood test.
Choose a random sample of people from the local area and random times throughout the day and measure
their blood sugar using both the wristband and a standard blood test.
Choose a random sample of people from the local area and random times and measure their blood sugar
using the wristband. Choose another random sample of people and random times and measure their blood
sugar using the standard blood test.
Go to a hospital and have the doctors choose a random sample of patients to be tested at random times
using both the wristband and the standard blood test.
Question 2
A farmer divided his piece of land into 4 equivalent groups. The quality of the soil is the same across
the 4 groups of land. He planted the same crop in all 4 groups of land and recorded the yield of the crop in
all 4 groups for a 4 week period. Is the study observational or experimental? If it is an experiment, what is
the controlled factor?
Select the correct answer below:
The study is an observational study.
The study is an experiment. The controlled factor is the 4 week observation period.
,The study is an experiment. The controlled factor is the land.
The study is an experiment. The controlled factor is the growth of the crops.
Question 3
To test the effectiveness of a drug proposed to relieve symptoms of headache, physicians included
participants for a study. They gave the drug to one group and a drug with no therapeutic effect to another
group. Which group receives the placebo?
Select the correct answer below:
the physicians
the group that received the drug for headache
the group that received the drug with no therapeutic effect
all of the people in the study
Question 4
Matthew has created a survey to test whether or not gender has any effect on political party associations.
What is the explanatory variable in this situation?
Select the correct answer below:
the number of people surveyed
political party associations
gender
none of the above
, Question 5
Is the statement below true or false?
Continuous data are the type of quantitative data that is the result of measuring.
Select the correct answer below:
True
False
Question 6
A doctor notes her patient's temperature in degrees Fahrenheit every hour to make sure the patient does
not get a fever. What is the level of measurement of the data?
Select the correct answer below:
nominal
ordinal
interval
ratio
Question 7
Karen wants to estimate the mean number of siblings for each student in her school. She records the
number of siblings for each of 200 randomly selected students in the school. What is the sample?
Select the correct answer below:
the 200 randomly selected students
Question 1
A company has developed a wristband for monitoring blood sugar levels without requiring direct blood
samples. It is interested in demonstrating the accuracy of the device for governmental approval and has
decided to test the claim "The glucose level reported by the wristband is within 10% of a standard blood
test result." Which of the following data collection processes would be appropriate? Select only one
answer choice.
Select the correct answer below:
Choose a random sample of employees at lunchtime and measure their blood sugar using both the
wristband and a standard blood test.
Choose a random sample of people from the local area and random times throughout the day and measure
their blood sugar using both the wristband and a standard blood test.
Choose a random sample of people from the local area and random times and measure their blood sugar
using the wristband. Choose another random sample of people and random times and measure their blood
sugar using the standard blood test.
Go to a hospital and have the doctors choose a random sample of patients to be tested at random times
using both the wristband and the standard blood test.
Question 2
A farmer divided his piece of land into 4 equivalent groups. The quality of the soil is the same across
the 4 groups of land. He planted the same crop in all 4 groups of land and recorded the yield of the crop in
all 4 groups for a 4 week period. Is the study observational or experimental? If it is an experiment, what is
the controlled factor?
Select the correct answer below:
The study is an observational study.
The study is an experiment. The controlled factor is the 4 week observation period.
,The study is an experiment. The controlled factor is the land.
The study is an experiment. The controlled factor is the growth of the crops.
Question 3
To test the effectiveness of a drug proposed to relieve symptoms of headache, physicians included
participants for a study. They gave the drug to one group and a drug with no therapeutic effect to another
group. Which group receives the placebo?
Select the correct answer below:
the physicians
the group that received the drug for headache
the group that received the drug with no therapeutic effect
all of the people in the study
Question 4
Matthew has created a survey to test whether or not gender has any effect on political party associations.
What is the explanatory variable in this situation?
Select the correct answer below:
the number of people surveyed
political party associations
gender
none of the above
, Question 5
Is the statement below true or false?
Continuous data are the type of quantitative data that is the result of measuring.
Select the correct answer below:
True
False
Question 6
A doctor notes her patient's temperature in degrees Fahrenheit every hour to make sure the patient does
not get a fever. What is the level of measurement of the data?
Select the correct answer below:
nominal
ordinal
interval
ratio
Question 7
Karen wants to estimate the mean number of siblings for each student in her school. She records the
number of siblings for each of 200 randomly selected students in the school. What is the sample?
Select the correct answer below:
the 200 randomly selected students
