1.13 Classify each of the following variables as either categorical or numerical. For those that are numerical, determine whether they are discrete or continuous.

Brand of computer purchased by a customer.

A)

State of birth for someone born in the United States.

B)

Price of a textbook

C)

Concentration of a contaminant (micrograms per cubic centimeter) in a water sample.

D)

Zip code (Think carefully about this one.)

E)

Actual weight of coffee in a1-poundcan, labeled as containing1pound

F)

1.15 For the following numerical variables, state whether each is discrete or continuous.

The length of a 1-year-old rattlesnake

A)

The altitude of a location in California selected randomly by throwing a dart at a map of the state

B)

The distance from the left edge at which a12-inchplastic ruler snaps when bent sufficiently to break

C)

The price per gallon paid by the next customer to buy gas at a particular station

D)

1.17 In a survey of100people who had recently purchased motorcycles, data on the following variables were recorded:

Sex of purchaser

Brand of motorcycle purchased

Number of previous motorcycles owned by purchaser

Telephone area code of purchaser

Weight of motorcycle as equipped at purchase

Which of these variables are categorical?

A)

Which of these variables are discrete numerical?

B)

Which type of graphical display would be an appropriate choice for summarizing the sex data, a bar chart or a dotplot?

C)

Which type of graphical display would be an appropriate choice for summarizing the weight data, a bar chart or a dotplot?

D)

1.27 Example 1.5gave the accompanying data on violent crime on public college campuses in Florida during 2016(fbi.gov, retrieved February 6, 2018):

Construct a dotplot using the16observations on number of violent crimes reported. Which schools stand out from the rest?

A)

One of the Florida schools has only861students and a few of the schools are quite a bit larger than the rest. Because of this, it might make more sense to consider a crime rate by calculating the number of violent crimes reported per1000students. For example, for Florida A&M University the violent crime rate would be

69928(1000)=(0.001)(1000)=1.0

Calculate the violent crime rate for the other15schools and then use those values to construct a dotplot. Do the same schools stand out as unusual in this dotplot?

B)

Based on your answers fromParts (a)and(b), write couple of sentences commenting on violent crimes reported at Florida universities and colleges in 2016.

C)

Example 1.5

University/College	Student Enrollment	Number of Violent Crimes Reported in 2016
Florida A&M University	9,928	6
Florida Atlantic University	30,380	6
Florida Gulf Coast University	14,833	3
Florida International University	49,782	15
Florida South Western State College	15,709	0
Florida State University, Tallahassee	40,830	20
New College of Florida	861	1
Pensacola State College	9,840	0
Santa Fe College	14,767	0
Tallahassee Community College	12,445	2
University of Central Florida	62,953	14
University of Florida	50,645	10
University of North Florida	15,675	3
University of South Florida, St. Petersburg	4,739	0
University of South Florida, Tampa	42,067	8
University of West Florida	12,763	10