A company wishes to purchase one of five different machines A,B,C,D, and 
E. In an experiment to decide whether there is a difference in performance of 
the machines five experienced operators each work on the machines. The table 
below shows the number of units produced. Test the hypothesis that there is no 
difference among the machines at the (a)5%level of significance, (b) 1% level 
of significance.

machine units produced

A 68 72 75 42 53
B 72 52 63 55 48
C 60 82 65 77 75
D 48 61 57 64 50 
E 64 65 70 68 53 

Please show your work, again I have an answer but no clear understanding.