Give reasons for 5 stars! Concern over the loss of local biodiversity has increa

Question

Give reasons for 5 stars!

Concern over the loss of local biodiversity has increased the urgency of understanding its consequences for ecosystem function in many habitats. Researchers compared the effect of intertidal seaweed species richness (monoculture vs. polyculture) and species identity (Cladophora, Endocladia, Mastocarpus, and Pelvetiopsis) on biomass accumulation in a mesocosm experiment. At the end of the experiment, they compared the proportional change in biomass among treatment groups using analysis of variance (richness: F1,141 = 0.001, p = 0.870; identity: F3,141 = 57.4, p < 0.001; interaction: F3,141 = 3.84, p = 0.024). Answer the following questions:

6. According to these data, what is the effect of seaweed species richness and species identity on average biomass accumulation?

A) biomass was significantly different in response to both species richness and identity

B) biomass was significantly different in response to species richness, but not identity

C) biomass was significantly different in response to species identity, but not richness

D) the effect of richness was different depending on species identity, a pattern that was statistically significant

7. What evidence did you use to determine your answer to the previous question?

A) richness: F1,141 = 0.001, p = 0.870

B) identity: F3,141 = 57.4, p < 0.001

C) both A and B

D) interaction: F3,141 = 3.84, p = 0.024

8. What is the probability of getting an F value of 57.4 if the null hypothesis is true in this case?

A) 3/141

B) 0.574

C) < 0.001

D) 1

9. What are the degrees of freedom associated with this particular statistical test?

A) 3

B) 141

C) 3 and 141

D) 144

Explanation / Answer

A) biomass was significantly different in response to both species richness and identity.

D) interaction: F3,141 = 3.84, p = 0.024.

B) 0.574.

A) 3

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