A car parts plant is concerned that some of its employees are more likely to call in sick on Fridays or Mondays (the plant operates only five days a week).An analyst randomly selects one week, and records the number of absences each day. The data are shown below in Exhibit 12.38.
Based on these sample data, is there evidence that absences differ over the days of the week? Use α = 5%.

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Number of Absences, Randomly Selected Week at a Car Parts Plant Wednesday riday Tuesday Monday 15 16