The National Safety Council released the following data on the incidence rates for fata or lost-worktime injuries per 100 employees for eight industries in three recent years.   Compute the covariance between each pair of years (2018 and 2019), (2018 and 2020) and (2019 and 2020). Compute the coefficient of correlation (r) for each pair of years and determine which years are most highly correlated.

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The National Safety Council released the following data on the incidence rates for fata or lost-worktime injuries per 100 employees for eight industries in three recent years.

 

  1. Compute the covariance between each pair of years (2018 and 2019), (2018 and 2020) and (2019 and 2020).
  2. Compute the coefficient of correlation (r) for each pair of years and determine which years are most highly correlated.
Industry
2018
2019
2020
Textile
0.46
0.48
0.69
Chemical
0.52
0.62
0.63
Communication 0.9
0.72
0.81
Machinery
1.5
1.74
2.1
Services
2.89
2.03
2.46
Nonferrous
1.8
1.92
2
metals
Food
3.29
3.18
3.17
Government
5.73
4.43
4
Transcribed Image Text:Industry 2018 2019 2020 Textile 0.46 0.48 0.69 Chemical 0.52 0.62 0.63 Communication 0.9 0.72 0.81 Machinery 1.5 1.74 2.1 Services 2.89 2.03 2.46 Nonferrous 1.8 1.92 2 metals Food 3.29 3.18 3.17 Government 5.73 4.43 4
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