Kanab High School Fall 2016
Question: Is sagebrush where grouse actually are higher than random sites?
The following table is the result of your data collected in Sink Valley. The results pool the data collected by the two teams into one dataset, with a sample size of 8, rather than 2 datasets with a sample size of 4. The shrub height in sage-grouse locations is different than random sites if the standard error bars do not overlap.
1. Was sagebrush height different between actual and random locations?
The following chart is each team’s data, by Flag number. Remember that Flags 1 and 3 were actual locations and Flags 2 and 4 were random locations.
2. What was the benefit of combining the two team’s data?
3. So, what does it mean that actual and random locations were the same height?
Question: Does ground vegetation differ between actual sagebrush locations and random locations?
The following figure depicts the average % composition found by each team in actual sage-grouse locations and random locations. The averages are different if the standard error bars are different.
4. Which vegetation compositions were different among the teams?
5. Why did you see so much variability?
The following figure depicts the average % composition when we pool the data from the two teams. This allows us to have a sample size of 8 (4 flags per team) rather than 2 sets of 4. The % composition differs between actual and random when the standard error bars do not overlap.
6. How does combining the data change the results, if at all?
7. How does season affect the data that we collect?