Consider the figure below representing the results of an experimental investigat

Question

Consider the figure below representing the results of an experimental investigation into the effects of population number and density on the fertilization success of the free-spawning red sea urchin (i.e., males and females release their gametes directly into the water column where they mix together to produce fertilized larvae):

a) What is/are the independent variables in this data set? The dependent variables?

b) If P < 0.05, what do the above results suggest about the relationship between fertilization success and urchin number in this population? Between fertilization success and urchin density?

c) If P > 0.05, what do the above results suggest about the relationship between fertilization success and urchin number in this population? Between fertilization success and urchin density?

d) Looking at the graphs, do these results provide evidence of an interaction between urchin number and density? Explain.

Explanation / Answer

a) independent variables : Density , water coloumn
dependent variables : population number , fertilized larvae

b) the relationship between fertilization success and urchin number in this population statistically significant

c) the relationship between fertilization success and urchin number in this population statistically unsignificant

d) yes , since has the density increases , percentage fertillization also increases

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