Agenda

Goals Info sheet Overview Begin Lesson 9.1- Apportionment

Hamilton Method Adjusting a list

HW Guide

Discrete vs. Continuous Data (Variables)

Discrete Math is not easily defined. NCTM states DM is “the study of mathematical properties of sets and systems that have only a finite number of elements.”

Discrete – values that can be counted Continuous – all values in an interval between

two specific values, such as temperature.

Statisticians gain information about situations by collecting data for random

variables.

Mathematics All Around. Thomas L. Pirnot

Portfolio Rubric Vocabulary Page Homework – Assignment # and date in top right

corner. Due in pencil on due date; corrected in pen for final portfolio.

News article / typed response Formula notecard (optional) Extra-credit topic (extension - not discussed in

class)Portfolios should represent your own work and

understanding; these are individualized for each learner. This allows us (student, teacher, parent) to see your strengths/weaknesses for assessment purposes. Late portfolios will be evaluated for half-credit.

Chapter 9 - Apportionment

• Vocabulary• Apportionment

Methods– Hamilton– Huntington-Hill– Jefferson– Adams– Webster

Hamilton Methodof Apportionment

•Gives each state integer part•Additional reps allocated by largest fractional part of exact representation

Example 1- In a recent census…

1) Alabama – Population 4041

2) Missississippi – Population 2573

3) Louisiana – Population 4220

Allocate 19 members of the U.S. House of Representatives to these three states.

• 1st find the percentage for each state’s population to the total population

State % of Delegates Delegates deserved

Integer Part

Fractional Part

Assign additional Members

AL

Miss

LA

Total

2) The Civics Arts Guild is having a show. There is room for 31 booths and the guild has decided that the booths will be assigned in proportion to the type of members in the guild. Th guild has 87 painters, 46 sculptors, and 53 weavers. Assign the booths to the three groups.

Your Turn

Group % of Booths Booths deserved

Integer Part

Fractional Part

Assign additional Booths

Painters

Sculptors

Weavers

Total

Warm-Up

p.517 # 11

Adjusting a List by Truncating

• Rank your biggest concerns about school. (1 representing your top concern)

• Choose from the following:– Peer Pressure– My friends/social life– My grades– My safety

State # ranked 1st

Original %

Truncated to tenths

Discarded Portion

Adjusted List

Peer Pressure

My Friends/ Social Life

My Grades

Safety

Total

Your Turn

• #17 on page 518.

Fairness of Apportionment

• Average constituency = Population of state/ number of reps from state

• Absolute unfairness=

l(avg constituency of A) – (avg constituency of B)l

• Relative Unfairness=

absolute unfairness / smaller average constituency

Example• Find the average constituency to

determine which state is more poorly represented. State A has a population of 27,600 and 16 representatives and state B has a population of 23,100 and 14 representatives.

• What is the absolute unfairness of this apportionment?

• What is the relative unfairness?

• Average Constituency of A =

• Average Constituency of B =

State A is more poorly represented.• The absolute unfairness is

1,725 – 1,650 = 75

• The relative unfairness =

27,6001,725

16

23,1001,650

14

750.045

1,650

Your turn

• # 26 on page 519

Warm-Up• Do # 29 on p. 519.

Lesson 9.2

The Huntington- Hill Apportionment Principle– The student will use the Apportionment

Criterion and the Huntington-Hill Apportionment Principle to determine the addition of representatives most fairly.

Apportionment Criterion• When assigning a representative among

several parties, make the assignment so as to give the smallest relative unfairness.

• Example: Suppose that State A has a population of 13,680 and 5 representatives, and State B has a population of 6,180 and 2 representatives. Use the apportionment criterion to determine which state is more deserving of one additional representative.

• If State A gets the rep then:

A) Calculate the average constituencies for each.

B) Calculate the relative unfairness for each.

• If State B gets the rep then:– Repeat steps A and B

• The smaller relative unfairness is the best

Your Turn• #1 on p.524

Huntington-Hill Apportionment

• Gives new rep preference by using the Huntington-Hill number.

• H-Hill number (based on Geometric mean)

• The larger number indicates which state should receive the additional representative.

2 2(population of ) (population of )

( 1) ( 1)

Y X

y y x x ?

Example• Iowa has a population of 2.8 million people and

6 representatives and Nebraska has a population of 1.6 million people and 3 representatives. Use the Huntington-Hill Principle to determine which state is more deserving of an additional rep.

2(2.8) 7.840.186667

6 7 42

Iowa Nebraska

2(1.6) 2.560.213333

3 4 12

Nebraska’s H-Hill number is larger so Nebraska deserves the additional rep.

• The Oil Consortium Board currently has 2 members from Naxxon, 2 from Aroco, and 1 from Eurobile. Use the Hamilton-Hill Apportionment Principle to decide which company should receive the next member on the board if Naxxon has 4,700 stockholders, Aroco has 3,700 and Eurobile has 1,600.

• Naxxon should get the next rep.

Your Turn

Warm-Up

• Use the Huntington-Hill apportionment principle to decide which state is more deserving of an additional rep.– The population of Alaska, New Hampshire,

and Wyoming are .6 million, 1.1 million and .5 million, respectively. Alaska has 1 rep, New Hampshire has 2, and Wyoming has 1.

Lesson 9.3

• Applications of the Apportionment Principle.– The student will use the Huntington-Hill

principle to apportion representatives or other objects in order.

• Now we are going to determine how to apportion a given number of representatives and in what order they should be distributed.

• Use the H-Hill method to apportion 10 reps among Utah, Idaho, and Oregon.The recent populations are Utah, 1.7 mil; Idaho, 1.0 mil; and Oregon, 2.8 mil. Begin by giving one rep to each state. List the order in which the reps are apportioned.

Calculate the H-Hill #’s

Current Representation Utah Idaho Oregon

1

2

3

4

5

6

7

Seat # Goes to # of add’l reps Utah

# of add’l reps Idaho

# of add’l reps Oregon

1

2

3

4

5

6

7

Your Turn

• #9 p.533

Lesson 9.4 Other Paradoxes & Apportionment Methods

• The student will discuss other paradoxes and investigate and use other methods of apportionment to assign additional representatives/objects.

Standard Divisor / Quota• Standard Divisor =Total population / number of reps being allocatedComputed once (a single number) used for the entire

apportionment process. The standard divisor is the # of constituents that each representative must represent.

Standard Quota =State’s population / standard divisorMust be computed individually for each state/client. The

standard quota is the # of representatives that a state deserves.

Calculate the standard divisor and each state’s standard quota.

• We want to apportion 8 representatives among:• State A with a population of 3 million.• State B with a population of 4 million.• State C with a population of 5 million.

Total Pop 12,000,000Standard divisor 1,500,000

# of Reps 8

Standard Quotas:

3,000,0002

1,500,000A

4,000,0002.67

1,500,000B

5,000,0003.33

1,500,000C

• Using Hamilton’s Method:• State A would receive 2 reps.• State B would receive 3 reps.• State C would receive 3 reps.

• Remember: Hamilton’s method uses the fractional parts to award additional reps.

• Using the Hamilton method each state receives either the number immediately above or below the standard quota.

Definitions

• Lower quota – the standard quota rounded down.

• Upper quota – the standard quota rounded up.

• If in making an apportionment, each state is allocated a # of reps that is between its lower and upper quota, then we say the apportionment satisfies the quota rule.

Restating Hamilton’s Apportionment Method

• Compute the standard divisor.• Compute the standard quota for each

state and round down to the lower quota. Assign reps.

• Assign additional reps according to the fractional parts of the standard quotas.

Warm-UpWe have 15 seats to apportion between the

following groups:Freshmen with 420 students, Sophomores

with 375 students, Juniors with 350 students and Seniors with 293 students.

A) Use the Hamilton Method of apportionment to distribute the seats.

B) Determine the relative unfairness between the freshmen and juniors.

C) Which group is more poorly represented?

Group % of Seats Seats deserved

Integer Part

Fractional Part

Assign additional Seats

Freshmen 29.2% 4.38 4 0.38 4

Sophomores 26.1% 3.915 3 0.915 4

Juniors 24.3% 3.645 3 0.645 4

Seniors 20.4% 3.06 3 0.06 3

Total 100% 15 13 15

Freshmen: AvgC= 105 Juniors: AvgC = 87.5

The relative unfairness is 0.2.

Which group is more poorly represented?

Average Constituencies:• Freshmen – 105• Sophomores – 93.75• Juniors – 87.5• Seniors – 97.7

The freshmen are more poorly represented.

Other paradoxes

• Population paradox – occurs when state A’s population is growing faster than state B’s population, yet A loses a representative to state B.

• New-States paradox – occurs when a new state is added, and its share of seats is added to the legislature causing a change in the allocation of seats previously given to another state.

Jefferson’s Apportionment Method

• Compute the standard divisor.• Rather than computing the standard quota,

compute a modified quota by using a divisor that is smaller than the standard divisor for the apportionment.– Modified quota = state’s population /

modified divisor• Calculate each state’s modified quota and

round DOWN. Assign representatives.• Keep varying the modified divisor until the

sum of these assignments is equal to the number being apportioned.

Ex) Southwest Water Authority• Assume that California, Nevada, and

Arizona are cooperating to build a dam to provide water to communities currently lacking adequate water supplies. Seats on the 11-member Southwest Water Authority, which governs the project, are assigned according to the number of customers in each state who use the water from the project. There are 56,000 customers in California, 52,000 in Arizona, and 41,00 in Nevada.

• Compute the standard divisor.• Modified Divisor = _________

California Arizona Nevada

Population 56,000 52,000 41,000

Standard Quota

Modified quota

Round Modified Quota ___________

13,545.45

4.13 3.84 3.03

13,000

DOWN

Adams’ Apportionment Method

• Compute the standard divisor.• Rather than computing the standard quota,

compute a modified quota by using a divisor that is larger than the standard divisor for the apportionment.– Modified quota = state’s population /

modified divisor• Calculate each state’s modified quota and

round UP. Assign representatives. • Keep varying the modified divisor until the

sum of these assignments is equal to the number being apportioned.

• Compute the standard divisor.• Modified Divisor = _________

California Arizona Nevada

Population 56,000 52,000 41,000

Standard Quota

Modified quota

Round Modified Quota ___________

13,545.45

4.13 3.84 3.03

14,000

UP

Webster’s Apportionment Method

• Compute the standard divisor.• Rather than computing the standard quota,

compute a modified quota by using trial and error to find a modified divisor.

• Calculate the modified quota for each state and round it in the usual way.

• Assign that number of representatives to each state.

• Keep varying the modified divisor until the sum of these assignments is equal to the total number being apportioned.

• Compute the standard divisor.• Modified Divisor = _________

California Arizona Nevada

Population 56,000 52,000 41,000

Standard Quota

Modified quota

Round Modified Quota ___________

13,545.45

4.13 3.84 3.03

13,545.45

NORMALLY

How perfect are they?Hamilton Jefferson Adams Webster

Can have Alabama paradox

Yes No No No

Can have population paradox

Yes No No No

Can have new-states paradox

Yes No No No

Can violate quota rule

No Yes Yes Yes

Revisiting the Oil ConsortiumCreating a 9 member board

• Naxxon = 4700• Aroco = 3700• Eurobile = 1600

1. Apportion using Hamilton Method2. Apportion using Huntington-Hill Method3. Apportion using Jefferson’s Method4. Apportion using Adams’ Method5. Apportion using Webster’s Method

Textbook Problemsas a class

• Page 548: 39-42• Page 549: 45• Page 550: 52

• Partner: Finish Handout if needed.

• You may work on your review for 9/23.

• The test will be on Thursday, 9/25 instead of 9/29. The Extra Credit and portfolio will be due on 9/29.