| Subject Code : | SCIE4402 | Country : | Australia |
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SCIE4402 - Experiment and Repeat Measures Model - Data Analytics Assessment Answer
Assessment Task:
ASSIGNMENT QUESTION 1: ANOVA
The BirdsTreatment1 data file contains measurements on the plasma calcium concentration (in mg/100ml) for male and female birds. Three treatments have been applied: (a) a placebo treatment (P), (b) hormone treatment 1 (T1), (c) hormone treatment 2 (T2).
Conduct an appropriate structured analysis of the data to determine whether or not there is a treatment effect. As part of your answer, you should include a boxplot or interaction plot and a summary table that reports the results of comparisons using the Tukey method. You need to include an introductory statement, which states the research question, several sentences that describe the process of investigation, and a final conclusion sentence that relates your findings back to the research question. Note you have two factors: gender and treatment, so you need to consider the potential for there to be an interaction.
ASSIGNMENT QUESTION 2: REPEAT MEASURES ANOVA
The Sheep1 data file contains measurements on six sheep that have been used to test the effectiveness of three aesthetic drugs. The time variable is the number of minutes each sheep was ‘asleep’ following administration of the drug. As part of the experiment, we administer, in random order, the three drugs to each sheep. Note, we wait a suitable time following each drug injection so
that we are completely sure the drug has worn off before the next application.
Conduct an appropriate structured analysis of the data to determine whether or not there is variation in the effectiveness of the three different drugs. As part of your answer, you should include a boxplot and a summary table that reports the results of comparisons using the Tukey method. You need to include an introductory statement, which states the research question, several sentences that describe the process of investigation, and a final conclusion sentence that relates your findings back to the research question.
ASSIGNMENT QUESTION 3: BLOCKING AS A RANDOM EFFECT
Four different types of malting barley are being trialled in Western Australia. The trial varieties are: Bass, Commander, Gairdner, and Sloop. Two different irrigation levels are also being trialed: high and low. The yield information is recorded in tonnes per hectare. Unfortunately, it was not possible to plant all the varieties at the same farm and so two separate farms were used to obtain yield data. The farm should be treated as a random effect. The data are in the BarleyR data file. Note that you will need to format the data prior to analysis.
Conduct an appropriate structured analysis of the data to determine which malting barley is the most promising variety. You need to include an introductory statement, which states the research question, several sentences that describe the process of investigation, and a final conclusion sentence that relates your findings back to the research question. Note you need to think about your test structure and apply a sensible decision rule. If a factor is not needed in the model then it can be removed from your model.
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