An article in Plant Disease [Effect of Nitrogen and Potassium Fertilizer Rates on Severity of Xanthomonas Blight

An article in Plant Disease [€œEffect of Nitrogen and Potassium Fertilizer Rates on Severity of Xanthomonas Blight of Syngonium Podophyllum€ (1989, Vol. 73(12), pp. 972€“975)] showed the effect of the variable nitrogen and potassium rates on the growth of €œWhite Butterfly€ and the mean percentage of disease. Data representative of that collected in this experiment is provided in the following table.

(a) State the appropriate hypotheses.

(b) Use the analysis of variance to test these hypotheses with α = 0.05.

(c) Graphically analyze the residuals from this experiment.

(d) Estimate the appropriate variance components.

Transcribed Image Text:

Potassium (mg/pot/wk) Nitrogen (mg/pot/wk) 30 120 59.5 58.2 90 45.5 42.5 61.0 61.3 54.5 55.9 50 53.5 51.9 34.0 35.9 150 36.5 37.4 32.5 33.8 250 42.7 40.4