a5 - Department of Statistics STATS351 Design and Analysis...

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Department of Statistics STATS351: Design and Analysis of Experiments Assignment 5 Semester 2, 2008 Due date: 4:00pm Monday, 20 October, 2008 1. [15 marks] Trapping is a standard technique used to survey insect pest species. The basic idea is to bait the trap with an attractant (often a pheromone or other type of sex attractant). An experiment that investigated the use of (E,E)-8,10 dodecadien-1-yl acetate as an at- tractant for the male pea moth was described by Perry, Wall and Greenway (Ecological Entomology, 1980, 385-396). This experiment used 4 treatments corresponding to using the attractant alone and with three different potential inhibitors. Four insect traps were used which were located at 4 sites that were separated by at least 300 meters. The idea was that this would mean the traps were far enough apart so that they would not inter- fere with each other (by competing for the same moths) but would be near enough to experience very similar weather conditions. The traps were baited on four different days and the number of moths trapped recorded. A 4 × 4 Latin square design was used to block on both day and site. The following results were obtained: Site Day 1 2 3 4 1 193 A 522 B 235 C 103 D 2 40 D 88 A 386 B 83 C 3 19 C 26 D 82 A 254 B 4 130 B 35 C 58 D 124 A
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