Question: Average afternoon temperatures for 4 different locations during the study period You will need sample means and sample variances for each of the groups. These
Average afternoon temperatures for 4 different locations during the study period
You will need sample means and sample variances for each of the groups. These are:
Urban: Mean = 83F; Variance = 3.8, N = 8
Grassland: Mean = 75F; Variance = 2 . 5 , N = 5
Forest: Mean = 68F; Variance = 1.4; N = 6
Wetland: Mean = 72F; Variance= 1.5; N = 3
- What does the acronym ANOVA represent?
- What is the purpose of the 'ANOVA' test in statistics?
- Using the data above, perform an ANOVA to determine if there are significant differences between the groups. Use the significance levels: 0.05 and 0.01.
- What is your sampling distribution for this test? (Hint: what distribution do you use to find your critical values?)
- What are your degrees of freedom? (Fin d bo th DF1 and DF2)
- What are your F-critical values [at 5% and 1% levels]?
- State your Null and Alternate (or research) hypotheses.
- What is your "Between group Variance"? (Note--this is TOUGH! You may check your answer with me via a private inbox message before proceeding. However, be sure to send me all of your work so that I can tell you where you went off-track if there is an issue)
- What is your "Within group Variance"? (This is also challenging, the same offer applies)
- What is your calculated F-value (F-ratio)?
- What can you conclude from the test results? Include a statement about whether you rejected or failed to reject your Null hypothesis etc.
- What are the disadvantages of the ANOVA. In other words, what are the limitations of this test?
- From the lecture, what is the Multiple Means Comparison (Post Hoc) Test used for? What are the advantages of this test over a traditional ANOVA?
Make sure to show the work.
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