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SCIE4401 Data Use in Science
Assignment Three
Data sets
You have to download the data for this assignment from the Meat and Livestock Australia website: see below.
Submitting Assignment THree
Your assignment is to be uploaded on the LMS. Please make sure you include an assignment cover sheet as the first page of the Assignment. Upload it as a pdf.
Assignment Due Date
The assignment is due by Sunday 8th September, 11:55pm.
Assignment content
All figures and tables must be appropriately formatted with axis labels etc. An example of an appropriate figure was provided with Assignment 2. An example of an appropriately formatted table is provided below, but with generic information included.
Table 1: Pairwise t-test results (p-values)
Location 1Location 2Location 3
Location 1Value 1--
Location 2Value 2Value 4-
Location 3Value 3Value 5Value 6
Note: p-values have been adjusted to control the familywise Type ## error rate using the ##### method.
General Marking matters
The question will be marked out of 100. All figures and tables must not only be appropriately formatted, but must also be set at an appropriate scale.
Alpha level
Use an alpha value of 0.10 for all hypothesis testing.
Question 1
The research question
There is economic theory that suggests that prices in different markets in different regions should be related to each other, otherwise someone can make money by trading between markets. But there are other factors at play as well, including transport costs, and local market conditions. You have been asked to undertake some analysis about whether, on average, the prices being paid for live cattle is different in 4 different markets in Australia, and, if they are statistically different, which markets you would assess as having statistically significant higher prices, and which tend to be lower.
Because your client has some training in statistics, they have asked for the analysis to be conducted with some specific requirements. The alpha level that you have to use is 0.1. You also have to report the results of comparisons between markets using a Holm correction for multiple comparisons and also, not using any adjustment for multiple corrections.
Data set
There is no data set provided. You are required to obtain the data directly from the Meat and Livestock Australia website.
There is a very clear requirement of which data you have to use.
You should conduct the analysis using weekly cattle prices for the years 2018 for the following four markets:
Armidale
Dubbo
Wagga
Finley
There are several different types of cattle traded: you one need is
yearling steers.
There are different weights of steers: You want the
330-400kg
There are also several different prices reported: you need
$/head
There are some criteria which should be switched to All: Sales prefix, Muscle score, Fat score
A brief video on how to download the data is included in LMS.
You need to watch this as it’s an important guide to showing you how to download the right data.
You need to download the relevant data into excel format for each of the towns. Then edit the data so you get the right time period. Then combine the results for each town into a single file it so that it can be used in the analysis, and then saved as a CSV file.
Structure and marks
20 marks out of 100 will be based on your generating the correct data set.
Your research report should provide an analysis about how average prices differ across the 4 markets.
The format of your report should be as follows (marks out of 100 reported):
Introduction (marks 10)
One or two sentences that state the purpose of the report. Your objective for this section is to leave the reader with a clear impression of what is to follow. The section should be sharp and focused. Original research is not required, you just need to restate the key information provided in the question.
Methods (marks 20)
This section is a little different to what a methods section would look in a traditional paper. For this question you can state the data source; the testing approach that you have used; the alpha level used for each test; the method of adjustment used for multiple comparisons etc. Your objective for this section is to ensure the reader is convinced you have followed a logical approach to testing.
Results (marks 40)
This will be the main section of your response. Report details in a table of the mean and standard deviation and number of observations of the prices, for each of the markets, in a well formatted table. Here you will also include an exploratory figure.