A web page design firm has two designs for an online hardware store. To determine which is the more effective design, the firm uses one page

in

the

Dallas

area

and

a

second

page

in

the

Miami

area.

For each visit, the firm records

the

amount

oftime

visiting

thesite

and

the

number

of

items

viewed.

Complete parts (a) through (c) below.

(a) What is the explanatory variable in this study? Is it qualitative or quantitative?

A.

The explanatory variable is the web page design. The explanatory variable is qualitative.

B.

The explanatory variable is

the

amount

oftime

visiting

thesite.

This explanatory variable is

quantitative.

C.

The explanatory variable is

the

number

of

items

viewed.

This explanatory variable is

quantitative.

D.

The explanatory variable is the

location.

This explanatory variable is qualitative.

(b) What are the two response variables? For each response variable, state whether it is qualitative or quantitative. Select all that apply.

A.

One response variable is

the

number

of

items

viewed.

This response variable is

quantitative.

B.

One response variable is the

location.

This response variable is qualitative.

C.

One response variable is

the

amount

oftime

visiting

thesite.

This response variable is

quantitative.

D.

One response variable is the web page design. This response variable is qualitative.

(c) Explain how confounding might be an issue with this study. Choose the correct answer below.

A.

Since there are two response variables in this study, they may interact, causing the results to be misleading or incorrect.

B.

Since the variables are not all quantitative or all qualitative, they may interact, causing the results to be misleading or incorrect.

C.

Since there is only one explanatory variable, and two response variables, the explanatory variable will not affect both response variables equally, resulting in misleading results.

D.

Since the designs are being tested with two different

locations,

preferences depending on the

location

may affect the response variables for those groups.