Dr. John Rasp's Statistics Website - DS280


	Dr. John Rasp's Statistics Website

DS280 - Intro to Statistics

Lecture Review #8 - Using Graphs

REVIEW QUESTIONS:

1) What is a pie chart? When should it be used?

2) What is a histogram? How is it constructed? When should it be used?

3) What is a bar chart and when should it be used?

4) What is a line graph and when should it be used?

Computational exercises:

1) The table below lists the areas (in square miles) for the fifty states. (Data source is the U.S. Census Bureau.) States located primarily east of the Mississippi River are indicated with an asterisk (*).

RI*	1,045	VA*	39,594	IL*	55,584	UT	82,144
DE*	1,954	KY*	39,728	IA	55,869	ID	82,747
CT*	4,845	OH*	40,948	MI*	56,804	OR	95,997
HI	6,423	TN*	41,217	GA*	57,906	WY	97,100
NJ*	7,417	LA	43,562	WA	66,544	CO	103,718
MA*	7,840	PA*	44,817	OK	68,667	NV	109,826
NH*	8,968	MS*	46,907	MO	68,886	AZ	113,635
VT*	9,250	NY*	47,214	ND	68,976	NM	121,356
MD*	9,774	NC*	48,711	SD	75,885	MT	145,552
WV*	24,078	AL*	50,744	NE	76,872	CA	155,959
SC*	30,109	AR	52,068	MN	79,610	TX	261,797
ME*	30,862	FL*	53,927	KS	81,815	AK	571,951
IN*	35,867	WI*	54,310

a) Sketch a histogram of the data for all fifty states. Interpret your graph.

b) Sketch a histogram of the data for just those states located east of the Mississippi River. Interpret your graph.

2) The data below are population figures on selected cities in Idaho. (Again, the data source is the Census Bureau.) Construct an appropriate graph to represent these data:

Boise	102,249
Idaho Falls	39,739
Lewiston	27,986
Nampa	25,112
Pocatello	46,340
Twin Falls	26,209

3) The Kingdom of Boravia derives tax revenues from four sources: individual income taxes, corporate income taxes, tariffs and duties, and license fees. Income figures are given below (in millions of phorgs, the Boravian currency). Construct an appropriate graph to represent the relative importance of these income sources.

Individual income taxes	$125M
Corporate income taxes	$55M
Tariffs and duties	$45M
License fees	$15M