Baiting traps to maximize beetle catch. A field experiment was conducted to compare the effectiveness of different traps for catching beetles (Journal of Chemical Ecology, Vol. 94, 2011). Paraffin traps were baited either with or without linalool. Also, the color of the trap was varied as green or yellow. Seven traps for each combination of bait and color—a total of 28 traps—were set 1 meter from the ground in a random grid pattern. After 5 days, the total number of beetles captured by each trap was determined.

The data (simulated from information provided in the journal article) are displayed in the following table.

The researchers are investigating the effect of bait type and color on the mean number of beetles captured by the traps. Analyze the data for the researchers. What do you conclude?

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With linalool Without linalool Yellow 17, 22, 13, 15, 14, 18, 11 29, 10, 6, 5, 12, 11, 13 Green 4,5,0,2,3,2,0 1,0,2,0,0,0,1