1.3 DATA COLLECTION AND
EXPERIMENTAL DESIGN EXAM AND
ANSWERS.
Determine whether the statement is true or false. If it is false rewrite it as a
true statement.
The method for selecting a stratified sample is to order a population in
some way and then select members of the population at regular intervals -
CorreCt Answers -False. The method for selecting a systematic sample is to
order a population in some way then select members of the population at
regular intervals
Determine whether the study is an observational study or an experiment.
Explain.
In a survey of 1188 adults in a country, 57% said the country's leader should
release all medical info that might affect their ability to serve - CorreCt
Answers -The study is observational because it does not apply a treatment
to the adults
Determine whether the study is an observational study or an experiment.
Explain.
To study the effects of social media on teenagers brains researchers showed
a few dozen teenagers photographs that had varying numbers of likes while
scanning the reactions in their brains - CorreCt Answers -The study is an
experiment because it applies a treatment to the teenagers
Assume the population of interest is the student body at a university.
, Question students as they leave an academic building a researcher ask 383
students about their eating habits
What type of sampling was used?
What potential sources of bias were present if any? Select all that apply. -
CorreCt Answers -Convenience sampling is used because students are
chosen due to convenience of location
Bias:
- The sample only consists of members of the population that are easy to
get. These members may not be representative of the population
- Because of the nature of the question students may not answer honestly
Identify the sampling techniques used and discuss potential sources of bias
(if any) explain.
In 1965 researchers used random digit dialing to call 1400 people and ask
what obstacles kept them from attending town hall meetings.
What type of sampling was used?
What potential sources of bias were present if any? Select all that apply. -
CorreCt Answers -Simple random sampling was used since each number
had an equal chance of being dialed so all samples of 1400 phone numbers
had an equal chance of being selected.
EXPERIMENTAL DESIGN EXAM AND
ANSWERS.
Determine whether the statement is true or false. If it is false rewrite it as a
true statement.
The method for selecting a stratified sample is to order a population in
some way and then select members of the population at regular intervals -
CorreCt Answers -False. The method for selecting a systematic sample is to
order a population in some way then select members of the population at
regular intervals
Determine whether the study is an observational study or an experiment.
Explain.
In a survey of 1188 adults in a country, 57% said the country's leader should
release all medical info that might affect their ability to serve - CorreCt
Answers -The study is observational because it does not apply a treatment
to the adults
Determine whether the study is an observational study or an experiment.
Explain.
To study the effects of social media on teenagers brains researchers showed
a few dozen teenagers photographs that had varying numbers of likes while
scanning the reactions in their brains - CorreCt Answers -The study is an
experiment because it applies a treatment to the teenagers
Assume the population of interest is the student body at a university.
, Question students as they leave an academic building a researcher ask 383
students about their eating habits
What type of sampling was used?
What potential sources of bias were present if any? Select all that apply. -
CorreCt Answers -Convenience sampling is used because students are
chosen due to convenience of location
Bias:
- The sample only consists of members of the population that are easy to
get. These members may not be representative of the population
- Because of the nature of the question students may not answer honestly
Identify the sampling techniques used and discuss potential sources of bias
(if any) explain.
In 1965 researchers used random digit dialing to call 1400 people and ask
what obstacles kept them from attending town hall meetings.
What type of sampling was used?
What potential sources of bias were present if any? Select all that apply. -
CorreCt Answers -Simple random sampling was used since each number
had an equal chance of being dialed so all samples of 1400 phone numbers
had an equal chance of being selected.
