A new treatment is developed for controlling aphid infestation in sorghum. In order to assess the effectiveness of the treatment, 100 sorghum plants were treated, and 100 sorghum plants were left untreated. The 200 plants were then exposed to aphids, and 1 week later the plants were classified into three categories of infestation, as given in the following table.

a. Provide a graph to compare the difference in infestations between the treatment and control.
b. Do the levels of infestation differ between the treatment and control plants? Use a = .05.
c. What are the populations to which your conclusion in part (b) is applicable?
d. Place 95% confidence intervals on the probabilities of infestation for both the treatment and the control plants.

Transcribed Image Text:

Level of Infestation Treatmen Leaf Infestation Stem Infestation No Infestation Treated Control 29 39 60 24 37