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Lesson 2

How can we investigate the relationship

between PM2.5 exposure and respiratory diseases?

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What did we do in the last class?

At the end of Lesson 1, we wondered…

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Experience the Phenomena

Chronic lower respiratory disease cases and mortality rates

County

Cases (% of population)

Mortality (number of deaths per 100,000 population)

Alexander

21.9

71.3

Boone

16.3

47.0

Champaign

16.0

34.8

Cook

15.4

27.0

DuPage

13.4

24.9

Ford

18.0

67.2

Hardin

19.7

95.2

Pulaski

20.6

39.6

Union

19.5

48.7

Vermilion

18.5

73.8

Illinois

14.2

36.2

United States

15.3

39.2

Chronic Lower Respiratory Disease in Illinois 2016-2020

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Investigate the Phenomena

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Correlation coefficient: a quantitative measure of the strength of a relationship between two variables.

Correlation Coefficient

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Correlation Coefficient: Perfect Negative Correlation

Source: Tableau

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Correlation Coefficient: Perfect Positive Correlation

Source: Tableau

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Correlation Coefficient: No Relationship

Where would you place the Hangzhou and Warsaw graphs? Between r = -1 and r=0, Between r= 0 and r=1?

Source: Tableau

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Correlation Coefficient

Source: Tableau