To test for any significant difference in the number of hours between breakdowns for four machines, the following data were obtained.

a. At the α = .05 level of significance, what is the difference, if any, in the population mean times among the four machines?
b. Use Fisher€™s LSD procedure to test for the equality of the means for machines 2 and 4. Use a .05 level of significance.

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Machlne 1 Machine 2 Machine 3 6.4 7.8 5.3 7.4 8.4 7.3 7.4 9.4 10.1 9.2 9.8 11.1 10.3 9.7 10.3 9.2 8.8 Machlne 4 9.9 12.8 12.1 10.8 11.3 11.5