The possible synergetic effect of insecticides and herbicides is a matter of concern to many environmentalists. It

Question:

The possible synergetic effect of insecticides and herbicides is a matter of concern to many environmentalists. It is feared that farmers who apply both herbicides and insecticides to a crop may enhance the toxicity of the insecticide beyond the desired level. An experiment is conducted with a particular insecticide and herbicide to determine the toxicity of the treatments.
Treatment 1: A concentration of .25 Î¼g per gram of soil of insecticide with no herbicide.
Treatment 2: Same dosage of insecticide used in treatment 1 plus 100 pg of herbicide per gram of soil.

Several batches of fruit flies are exposed to each treatment, and the mortality percent is recorded as a measure of toxicity. The following data are obtained:
Treatment 1 Treatment 2
40.................... 36
28.................... 49
31.................... 56
38.................... 25
43.................... 37
46.................... 30
29.................... 41
18....................
Determine if the data strongly indicate different toxicity levels among the treatments.