Records were kept on the relationship between the rainfall and the yield of wheat. The nine data pairs below represents the data from the study. Test the significance the correlation coefficient using table 11 and level of significance of 0.01.

rainfall in in, x- 11 9.3 12.9 13 19.3 10.8 7.5 16.1 16.5

yield in bushels per acre, y- 51.5 47.2 59.8 60 83.4 50.2 32.9 77 79.8

d) find linear regression equation.

e)interpret the slope of the equation as a rate of change.

F) use the equation to predict the yield for 12 in of rain.