E1.1. a) Find the missing information from the following data of weekly salary. b) Which group shows less variation among the salaries? | | Group I | Group II | Group III | Combined values | | :--- | :--- | :--- | :--- | :--- | | Number of observations | n? = 50 | n? = ? | n? = 90 | 200 | | Standard deviation | ?? = 6 | ?? = 7 | ?? = ? | 7.746 | | Mean | x?? = 113 | x?? = ? | x?? = 115 | 116 |
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We have three groups with different numbers of observations (n1, n2, n3), standard deviations (σ1, σ2, σ3), and means (μ1, μ2, μ3). Some of these values are missing and need to be found. The total number of observations across all groups is 200. Show more…
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