Refer to the problem stated in Exercise 10.72, but now suppose that the study was conducted at 16 farms, of which 8 were selected for planting strain A and the other 8 for strain B. Here also the plots used were all of equal sizes. Recorded below are the data of yields in pounds per plot.

(a) Is there strong evidence that strain A has a higher mean yield than strain B? State the assumptions you make and use α = .05.
(b) What should be randomized in this experiment and how?
(c) Check to see that each data set here is just a scrambled form of the data set in Exercise

Strain A 23 39 19 28 42 43 33 29 Strain B 20 2 40 34 33 18 33 21