Give reasons for 5 stars! To test how predicted increases in nitrogen deposition

Question

Give reasons for 5 stars!

To test how predicted increases in nitrogen deposition might affect species rich temperate grassland ecosystem, researchers set up the following experiment: control plots received normal levels of nitrogen, whereas experimental plots received elevated nitrogen. At the end of the growing season, the researchers measured aboveground plant biomass (an index of net primary production, NPP; p = 0.010) and plant species diversity (1/D; p = 0.027) in multiple plots. Answer the following questions:

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

A) average NPP

B) species diversity (1/D)

C) both A and B

D) normal/elevated nitrogen level

3. What does the height of each bar represent, per graph?

A) mean NPP/diversity

B) median NPP/diversity

C) maximum NPP/diversity

D) variance in NPP/diversity

4. What is/are the null hypothesis/hypotheses for this experiment?

A) equal mean NPP/diversity in the control and experimental groups

B) equal variance in NPP/diversity in the control and experimental groups

C) different mean NPP/diversity in the control and experimental groups

D) more mean NPP and less mean diversity in the control and experimental groups, respectively

5. What statistical test(s) would be most appropriate for evaluating these hypotheses?

A) chi-square

B) a single one-way ANOVA

C) multiple one-way ANOVAs

D) a single two-way ANOVA

Explanation / Answer

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

A) average NPP---------answer

B) species diversity (1/D)

C) both A and B-

D) normal/elevated nitrogen level

3. What does the height of each bar represent, per graph?

A) mean NPP/diversity---------answer

B) median NPP/diversity

C) maximum NPP/diversity

D) variance in NPP/diversity

4. What is/are the null hypothesis/hypotheses for this experiment?

A) equal mean NPP/diversity in the control and experimental groups---------answer

B) equal variance in NPP/diversity in the control and experimental groups

C) different mean NPP/diversity in the control and experimental groups

D) more mean NPP and less mean diversity in the control and experimental groups, respectively

5. What statistical test(s) would be most appropriate for evaluating these hypotheses?

A) chi-square

B) a single one-way ANOVA

C) multiple one-way ANOVAs

D) a single two-way ANOVA---------answer

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