4. Below are given the yields per acre of wheat for six plots entering a crop competition, three of the plots sown with wheat of variety A and three with B Variety Yields in fields per acre 2 3 A 30 32 32 B 20 18 16 Set up table of analysis of variance and calculate F. State whether the difference between the yields of two varieties is significant taking 7.71 as the table vale at 5% level. (25 marks)