1. What is/are the independent variable(s)? a. Neighbors present/removed b. Elev

Question

1. What is/are the independent variable(s)?

a. Neighbors present/removed

b. Elevation

c. Both A and B

d. Survival

2. What is/are the dependent variable(s)?

a. Neighbors present/removed

b. Elevation

c. Both A and B

d. Survival

3. What was the mean effect of neighbor removal on alpine plant survival?

a. Positive

b. Negative

c. Depends on the elevation

d. No statistically significant effect

4. What was the mean effect of elevation on alpine plant survival?

a. Positive

b. Negative

c. Depends on the presence/absence of neighbors

d. No statically significant effect

5. What evidence did you use to determine your answer to the previous two questions?

a. Treatment: F1,206-8.47, p=0.004

b. Elevation: F1,206=2.10, p=0.149

c. Both A and B

d. Interaction: F1, 206=22.13, p<0.001

6. Do these data provide evidence for in support of the idea that positive interactions among species are more important under stressful conditions?

a. No; Effects of neighbors were not statistically significant

b. No; Effects of neighbors were different at different elevations

c. Yes; Effects of neighbors were not sitatistically significant

d. Yes; Effects of neighbors were different at different elevations

Explanation / Answer

1) Answer is c

Both the variables neighbours present/absent and Elevation is not at all dependent on any of the other variables so they are considered as independent variables.

2) d Survival

Survival is a dependent variable as it is dependent on Neighbours present/removed and elevation. As you can see in the graph given above the survival increases as the elevation increases provided neighbours are present

3) c Depends on elevation

As you can see in the graph given above as the elevation increases the survival goes down in the absence of neighbour or in case of neighbour removed

4 c Depends on neighbour removed/ present

As shown in the graph as the elevation increases the survival also goes up provided neighbours are present in the vicinity. If the condition where elevation increases and neighbours removed survival comes down.

6 d) effects of neighbours were different at different elevation, Yes the presence of neighbours do have a positive effect especially when the elevation increases

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