Question

A researcher wishes to determine whether the rate of water flow (in liters per second) over an experimental soil bed can be used to predict the amount of soil washed away (in kilograms). In this study, the explanatory variable is the

A. rate of water flow.
B. amount of eroded soil.
C. depth of the soil bed.
D. size of the soil bed.
E. None of the above.

(b) A researcher measures the correlation between two variables. This correlation tells us

A. the strength of a straight line relation between two variables.
B. whether there is a relation between two variables.
C. whether a cause-and-effect relation exists between two variables.
D. whether or not a scatterplot shows an interesting pattern.
E. None of the above.

(c) The Columbus Zoo conducts a study to determine whether a household's income can be used to predict the amount of money the household will give to the zoo's annual fund drive. The response variable in this study is

A. the Columbus Zoo.
B. a household's income.
C. all households in Columbus.
D. the amount of money a household gives to the zoo's annual fund drive.
E. None of the above.

Answer 1

ANSWERS:

a.) A.) Rate of water flow.

Explanation:

Since the variable "Rate of water flow" is used to predict the amount of soil washed away, hence in this case, the variable "Rate of water flow is explanatory variable.

b.) A.) the strength of a straight-line relation between two variables.

Explanation:

Since the definition of correlation coefficient is "the degree of the linear relationship between two variables."

c.) D.) the amount of money a household gives to the zoo's annual fund drive.

Explanation:

Since this variable is predicted hence this is the response variable for this study.