SOLVED: 3. (25) An experiment was conducted in a completely randomized design to study the effect of insecticides and fertilizer, on the control of hornworm infestations on a crop plant. The insecticide types were four sources of bacillus, and two types of chemicals. There are 4 types of fertilizer. The number of worms present was counted before and after treatment. The results of the experiment are as follows. The response variable should be the difference “After” – “Before”. Fertilizer 1 2 3

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