A manufacturing company purchases 4 wiring machines for the production of plastic wiring tube.The quality control manager is very concerned with the output of the production and would like to check whether the average length for the final product is the same or not.The following data represent random samples of length measures (in centimeter, cm) for 20 products made by the different wiring machine. The data is then analyzed using Excel. The results are as follow. Use ?=0.05 to test the hypotheses. Assume the lengths for these wiring equipment' productions are normally distributed.

Machine 1~ Machine 2~ Machine 34 Machine 40 11.2+ 12.1+ 11.6 10.5- 11.56 11.7+ 11.46 11.14 10.16 11.8 11.246 10.8 12.54 12.1+ 11.146 11.4 10.9 10.9 10.8 Anova: Single Factor SUMMARY Groups Count Sume Average Variance Column 10 43.6+ 10.96 0.1+ Column 2~ 68.5+ 11.4166+ 0.7296666+ Column 30 68.96 11.4833+ 0.2696666- Column 40 45.2+ 11.3+ 0.0333333+ ANOVA~ Source of Variation MS- P-value- F crite Between Groups 0.9213334 36 0.307111- 0.91052- 0.45788- 3.23887 Within Groups 5.39666+ 16+ 0.33729164 Total