STAT100: Assessment of Alpaca Behaviour - Statistics Assignment Help

Assignment Task:

Task:

Alpacas are reported to be effective as a guardian species for sheep flocks. A UNE study investigated the behaviour of n=44 alpacas (n=22 male and n=22 female, of which 10 were pregnant at the time of the study) in relation to sheep guardianship. Part of the study methodology included (a) two different alpaca temperament tests and (b) an arena test to determine if alpacas were more likely to be attracted towards younger, more vulnerable sheep (lambs), or older sheep (ewes). One of the temperament tests included measurement of flight speed where each alpaca was timed to travel over a distance of 3 m following release from an isolation crate. Another temperament test measured the total time each alpaca was observed pacing (walking in a heightened alert status) in an enclosed area over a period of 2 minutes following the flight speed test. In an arena test, alpaca preference towards younger or older sheep was evaluated by observing if each alpaca positioned themselves within close proximity (1 m) to either lambs or ewes retained in a small pen.

The variables in the A2alpaca.csv dataset include:
• id: alpaca identity number (1 - 44)
• sex: the sex of each alpaca (male OR female)
• pregstatus: pregnancy status by sex of each alpaca (male = nonpregnant males, nonpregnantF = non pregnant females OR pregnantF = pregnant females)
• flightspeed: the period of time (sec) for each alpaca to travel 3 m after release from an isolation crate
• pacing: the total period of time (sec) each alpaca was observed to pace in a confined space
• preference: alpaca preference for either lambs or ewes (ewe, lamb OR none)

University of New England STAT100 T3 2020
The UNE researchers were interested in 3 different research questions. Each question is worth 15 marks. Overall presentation (see guidelines below) is worth an additional 5 marks.
1. Using ANOVA, determine if there a difference in the mean flight speed of alpacas related to pregnancy status?
2. Was there an association between flight speed and time spent pacing for the male alpacas?
HINT: Create a new dataset which only contains the male alpaca subjects to use in your analysis for this question. This can be done in RStudio using alpaca <- read.csv(file.choose())
male_only <- alpaca[alpaca$sex=="male",] attach(male_only)
(a) State your hypothesis and run the appropriate checks and analysis using the 4-step hypothesis framework.
(b) What equation could be used to predict flight speed from based on the time alpacas spend pacing?
3. Does the data provide evidence to suggest that alpaca preference for age of sheep (ewes or lambs) is associated with sex?

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