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Concerned about Friday absences, management examined the number of persons absent for each of the past...

Concerned about Friday absences, management examined the number of persons absent for each of the past three Fridays. Does this sample provide sufficient evidence to conclude there is a significant difference in the average number of absences? Use alpha = .05.

Plant 1

Plant 2

Plant 3

Plant 4

19

17

27

22

24

20

32

27

20

16

27

25
  1. Is there sufficient evidence of a difference in the variances in number of absences among the four plants? (Set alpha = to .05)

  1. Provide the p-value for part a, and explain its meaning in words.

  1. Is there sufficient evidence to indicate a difference in the mean number of absences among the four plants? (Set alpha = to .05)

  1. Provide the p-value for part a, and explain its meaning in words.

  1. If there is a difference in the means, what test would you use to figure out which ones are different?
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