]

In some states in the U.S., the law requires drivers to have their headlights in

daytime when driving under the rain. A highway patrol officer would like

to investigate what

percentage of drivers is following the rule. A random sample of 200 cars on a rainy afternoon

was drawn and 74 of them have their headlights on.

a

)

Identify

the subjects of interest

.

[

0.5]

b

)

Suggest

a

name

for

the

variable of

interest

.

[

0.5]

c) Identify

the type

for

the

variable

of interest.

[

0.5]

d) Identify

the scale of measuremen

t for the variable of interest.

[

0.5]

e

)

Identify the most appropriate statistic.

[

0.5]

f

)

Provide a description

for

the

appropriate statistic

you identified in part

e

)

.

[

1]

g

) Report the value of the appropriate statistic you identified in part

e

).

[

0.5]

h)

The following two graphs were generated in StatGraphics

for the variable

e of interest.

"Yes"

means headlights on. Which graph is a better graph to use here?

Briefly justify your answer.

0

mark if no justification.

[

1]