Researchers studying patterns of variation in resource availability and diversit

Question

Researchers studying patterns of variation in resource availability and diversity within communities found an inverse relationship between tropical rain forest tree species richness and a composite index of soil fertility (nutrient availability) (r= -0.68; P <0.001):

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

a) soil fertility

b) species per 0.1 ha

c) both A and B

d) cannot be determined

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

a) soil fertility

b) species per 0.1 ha

c) both A and B

d) cannot be determined

3) What is the most precise description of the relationship between nutrients and richness?  

a) positive

b) negative

c) correlation of -0.68

d) there is no apparent relationship

4) Is this relationship (if any) statistically significant?

a) yes, by a lot

b) yes, by a little

c) no

d) cannot be determined

5) What evidence did you use to determine your answer to the previous question?  

a) r = -0.68      

b) P = 0.05

c) P < 0.001

d) visual inspection of the data

6) The value -0.68 represents what in this example?

            a) slope

b) intercept

c) coefficient of determination

d) correlation coefficient

7) What is the null hypothesis associated with this analysis?

a) means of x and y are equal

b) variances of x and y are equal

c) no association between x and y

d) slope of line y = bx + a is zero

8) What is a hectare (ha)?          

a) 100 m2

b) 1000 m2

c) 10,000 m2

d) 1 km2

Explanation / Answer

1. c) both A and B

2.d) cannot be determined.

because the answer is variation in resource availability and diversity within communities

3.b) negative.

because the species richness is more when nutriet availability is less. coeffecient coefficient is -0.68

4.a) yes, by a lot. because relation is significant at p>0.001

5.c) P < 0.001. means out of 100 observation only 1 could not fit to the theory

6.d) correlation coefficient

7.c) no association between x and y

8.1 hectare=c) 10,000 m2

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