An electrical engineer is interested in the effect on the tube conductivity of five different types of coating for cathode ray tubes used in telecommunications system display device.  The following conductivity data are obtained:                           Coating Type                                                              1                      143      141      150      146                                     2                      152      149      137      143                                     3                      134      133      132      127                                     4                      129      127      132      129                                     5                      147      148      144      142  At 5% level of significance, is there any difference in conductivity due to coating type? What is the value of test statistic?

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