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Theory exercises week 5 - DAS
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This document contains all the right responses for the theory exercises of week 5 for Data Analytics for Engineers course.
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Question 1Correct
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A data analyst wants to find out what mental effects the corona period has on people in the age range of 20-30 years old.
He sends a questionnaire to a large number of people in this age category. He can consider the questionnaire answers as
Select one:
a.
Primary data
b.
Secondary data
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Question 2
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Next to this data, he receives statistical records about mental health from psychologists. For him, this data is:
Select one:
a.
Secondary data
b.
Primary data
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Information
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,Question 3
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In a study from 1990, the following reasoning was used:
Burning of fuel results in emitting NO2 into the air and cars use fuel. So the more cars, the higher NO2
concentration in the air.
Which of the following statements about this reasoning are true? (multiple statements might be true)
Select one or more:
a.
This is an example of inductive reasoning.
b.
This is an example of deductive reasoning.
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Question 4
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An expert in human behavior makes the following statements about the effects of a lockdown on mental health effects:
1. Young people need a lot of social interaction to feel happy
2. In a lockdown, social interaction is dramatically reduced
--> Therefore people are less happy in a lockdown
Which reasoning does he apply?
Select one:
a.
, Induction
b.
Deduction
Feedback
Your answer is correct.
Deduction: If the given statements, called premises, are true and the reasoning is valid, then the conclusions are true.
Induction is based on the idea that the universe is ordered and governed by general laws. The underlying principle: if a
phenomenon/object/… X has been observed under a wide variety of conditions, and if all the observed X’s has a certain
property P, than all X’s has this property.
Question 5
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After receiving the first 20 answers to the questionnaire sent to several thousands of people, the data analyst sees that the
average ‘happiness’ is higher in the lockdown period than in the period before corona. He concludes that people are happier
in a lockdown.
Select one:
a.
This is a wrong application of deductive reasoning because the sample size from the lockdown period is too small.
b.
This is a wrong application of inductive reasoning, because the sample size from the lockdown period is too small.
This is a case of induction. And the sample size too small to conclude anything.
c.
This is a correct application of inductive reasoning, because the happiness has increased compared to previous
questionnaire data.
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