STATS Statistical Practice I Assignment 3 Semester 1, 2013 Due: by 5:00 pm, Wednesday 8 May Cover sheet: You must staple a cover sheet with your full name and practical time on the front of the assignment. Copies of the cover sheet will be can be obtained from MyUni (in the Assignments folder). Submitting assignments: Your assignment is to be posted in the STATS box corresponding to the your practical (computer laboratory) time. These boxes are in Room EMG05, on the ground oor of the Engineering and Mathematics Building (opposite EMG13). Late assignments: DO NOT post late assignments in the assignment boxes. Hand-in to the Maths Oce, 6th oor, Ingkarni Wardli. Note that late assignments may suer a marks penalty. The following questions are to be handed in for marking. 1. Rabbits are major pests in some countries. Researchers, who are studying these animals, would like a reliable method to estimate the age of a free-living rabbit. Body weight is not a good predictor for age, since the environmental conditions in which the rabbits live have a large inuence on the available food supply and therefore the weight. It turns out, that the dry weight of the eye lens is a much more reliable predictor for age. The le Rabbit.txt (on MyUni) contains measurements on the age (in days) and the dry weight of the eye lens in milligrams for 71 rabbits. The rabbits were born and lived free in a large enclosure and depended on natural food supply. Download and open the dataset in SPSS. (Remember to check the Yes option for Are Variable Names Included). (a) i. Identify the response and explanatory variable. ii. Fit quadratic, power and exponential regression functions for age as a function of dry weight of eye lens. Include the scatterplot with the three curves tted to the data, and the Model Summary table. (Instructions to obtain the output are in Practical 5.) (b) i. Among these three regression models select the one that is the most appropriate t for this data set. Explain (referring…