Skip to main content
Mathematics LibreTexts

4.3.1: Preparation 4.3

  • Page ID
    148769
  • \( \newcommand{\vecs}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}} } \)

    \( \newcommand{\vecd}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash {#1}}} \)

    \( \newcommand{\dsum}{\displaystyle\sum\limits} \)

    \( \newcommand{\dint}{\displaystyle\int\limits} \)

    \( \newcommand{\dlim}{\displaystyle\lim\limits} \)

    \( \newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\)

    ( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\)

    \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\)

    \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\)

    \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\)

    \( \newcommand{\Span}{\mathrm{span}}\)

    \( \newcommand{\id}{\mathrm{id}}\)

    \( \newcommand{\Span}{\mathrm{span}}\)

    \( \newcommand{\kernel}{\mathrm{null}\,}\)

    \( \newcommand{\range}{\mathrm{range}\,}\)

    \( \newcommand{\RealPart}{\mathrm{Re}}\)

    \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\)

    \( \newcommand{\Argument}{\mathrm{Arg}}\)

    \( \newcommand{\norm}[1]{\| #1 \|}\)

    \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\)

    \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\AA}{\unicode[.8,0]{x212B}}\)

    \( \newcommand{\vectorA}[1]{\vec{#1}}      % arrow\)

    \( \newcommand{\vectorAt}[1]{\vec{\text{#1}}}      % arrow\)

    \( \newcommand{\vectorB}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}} } \)

    \( \newcommand{\vectorC}[1]{\textbf{#1}} \)

    \( \newcommand{\vectorD}[1]{\overrightarrow{#1}} \)

    \( \newcommand{\vectorDt}[1]{\overrightarrow{\text{#1}}} \)

    \( \newcommand{\vectE}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash{\mathbf {#1}}}} \)

    \( \newcommand{\vecs}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}} } \)

    \(\newcommand{\longvect}{\overrightarrow}\)

    \( \newcommand{\vecd}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash {#1}}} \)

    \(\newcommand{\avec}{\mathbf a}\) \(\newcommand{\bvec}{\mathbf b}\) \(\newcommand{\cvec}{\mathbf c}\) \(\newcommand{\dvec}{\mathbf d}\) \(\newcommand{\dtil}{\widetilde{\mathbf d}}\) \(\newcommand{\evec}{\mathbf e}\) \(\newcommand{\fvec}{\mathbf f}\) \(\newcommand{\nvec}{\mathbf n}\) \(\newcommand{\pvec}{\mathbf p}\) \(\newcommand{\qvec}{\mathbf q}\) \(\newcommand{\svec}{\mathbf s}\) \(\newcommand{\tvec}{\mathbf t}\) \(\newcommand{\uvec}{\mathbf u}\) \(\newcommand{\vvec}{\mathbf v}\) \(\newcommand{\wvec}{\mathbf w}\) \(\newcommand{\xvec}{\mathbf x}\) \(\newcommand{\yvec}{\mathbf y}\) \(\newcommand{\zvec}{\mathbf z}\) \(\newcommand{\rvec}{\mathbf r}\) \(\newcommand{\mvec}{\mathbf m}\) \(\newcommand{\zerovec}{\mathbf 0}\) \(\newcommand{\onevec}{\mathbf 1}\) \(\newcommand{\real}{\mathbb R}\) \(\newcommand{\twovec}[2]{\left[\begin{array}{r}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\ctwovec}[2]{\left[\begin{array}{c}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\threevec}[3]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\cthreevec}[3]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\fourvec}[4]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\cfourvec}[4]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\fivevec}[5]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\cfivevec}[5]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\mattwo}[4]{\left[\begin{array}{rr}#1 \amp #2 \\ #3 \amp #4 \\ \end{array}\right]}\) \(\newcommand{\laspan}[1]{\text{Span}\{#1\}}\) \(\newcommand{\bcal}{\cal B}\) \(\newcommand{\ccal}{\cal C}\) \(\newcommand{\scal}{\cal S}\) \(\newcommand{\wcal}{\cal W}\) \(\newcommand{\ecal}{\cal E}\) \(\newcommand{\coords}[2]{\left\{#1\right\}_{#2}}\) \(\newcommand{\gray}[1]{\color{gray}{#1}}\) \(\newcommand{\lgray}[1]{\color{lightgray}{#1}}\) \(\newcommand{\rank}{\operatorname{rank}}\) \(\newcommand{\row}{\text{Row}}\) \(\newcommand{\col}{\text{Col}}\) \(\renewcommand{\row}{\text{Row}}\) \(\newcommand{\nul}{\text{Nul}}\) \(\newcommand{\var}{\text{Var}}\) \(\newcommand{\corr}{\text{corr}}\) \(\newcommand{\len}[1]{\left|#1\right|}\) \(\newcommand{\bbar}{\overline{\bvec}}\) \(\newcommand{\bhat}{\widehat{\bvec}}\) \(\newcommand{\bperp}{\bvec^\perp}\) \(\newcommand{\xhat}{\widehat{\xvec}}\) \(\newcommand{\vhat}{\widehat{\vvec}}\) \(\newcommand{\uhat}{\widehat{\uvec}}\) \(\newcommand{\what}{\widehat{\wvec}}\) \(\newcommand{\Sighat}{\widehat{\Sigma}}\) \(\newcommand{\lt}{<}\) \(\newcommand{\gt}{>}\) \(\newcommand{\amp}{&}\) \(\definecolor{fillinmathshade}{gray}{0.9}\)

    Your next collaboration will focus on the Social Security program. Social Security provides income for people who are elderly or disabled.

    The following information is from the Social Security Administration website:4

    Social Security is financed through a dedicated payroll tax. Employers and employees each pay 6.2 percent of wages up to the taxable maximum of $160,200 (in 2023), while the self-employed pay 12.4 percent.

    When a person reaches “full retirement age,” he or she can claim a full retirement benefit. If someone retires before full retirement age, he or she receives a lower benefit.

    (1) Use the following information from the Social Security Administration website to answer the questions below.5

    Full retirement age is the age at which a person may first become entitled to full or unreduced retirement benefits.

    No matter what your full retirement age (also called "normal retirement age") is, you may start receiving benefits as early as age 62 or as late as age 70.

    If You Retire Early

    You can retire at any time between age 62 and full retirement age. However, if you start benefits early, your benefits are reduced a fraction of a percent for each month before your full retirement age.

    The chart below lists age 62 reduction amounts and includes examples based on an estimated monthly benefit of $1000 at full retirement age.

    Full Retirement and Age 62 Benefit By Year Of Birth

    Full Retirement At Age 62

    Year of Birth

    Full (normal) Retirement Age

    Months between age 62 and full retirement age

     

    A $1000 retirement benefit would be reduced to

    The retirement benefit is reduced by

    A $500 spouse's benefit would be reduced to

    The spouse's benefit is reduced by

    1937 or earlier

    65

    36

     

    $800

    20.00%

    $375

    25.00%

    1938

    65 and 2 months

    38

     

    $791

    20.83%

    $370

    25.83%

    1939

    65 and 4 months

    40

     

    $783

    21.67%

    $366

    26.67%

    1940

    65 and 6 months

    42

     

    $775

    22.50%

    $362

    27.50%

    1941

    65 and 8 months

    44

     

    $766

    23.33%

    $358

    28.33%

    1942

    65 and 10 months

    46

     

    $758

    24.17%

    $354

    29.17%

    1943-1954

    66

    48

     

    $750

    25.00%

    $350

    30.00%

    1955

    66 and 2 months

    50

     

    $741

    25.83%

    $345

    30.83%

    1956

    66 and 4 months

    52

     

    $733

    26.67%

    $341

    31.67%

    1957

    66 and 6 months

    54

     

    $725

    27.50%

    $337

    32.50%

    1958

    66 and 8 months

    56

     

    $716

    28.33%

    $333

    33.33%

    1959

    66 and 10 months

    58

     

    $708

    29.17%

    $329

    34.17%

    1960 and later

    67

    60

     

    $700

    30.00%

    $325

    35.00%

    (a) Who can collect full retirement benefits at age 65?

    (b) At what age can someone born in 1950 collect full benefits?

    (c) What is the youngest age at which you can begin collecting reduced benefits?

    SOCIAL SECURITY REFORM

    There is concern about the Social Security program because it is projected to eventually run out of money. Based on the current program, the Social Security program is projected to be able to pay all benefits through the year 2033. After that, it will only take in enough money to pay three-fourths of benefits.6 There is broad agreement that the program should be reformed now to avoid this future budget problem, but there is not an agreement about how that should be done. The following are possible solutions that have been proposed:

    • Increase the tax rate for paying into Social Security.
    • Increase the limit on wages so that people pay Social Security on wages above $160,200.
    • Decrease future benefits.
    • Increase the retirement age.
    • Change the program into a system of private retirement accounts in which individuals invest their own money.

    Projections about Social Security are based on many variables. One of these is life expectancy. Life expectancy is a prediction about how long people live on average. It is important to understand that this is a mean. When you studied mean in Module 2, you learned that a data set can have values far above or below the mean. If a large group of people has a life expectancy of 63 years, some people will die very young, even as infants, and some will live to be over 100.

    This might lead you to ask if using a mean to measure life expectancy is very accurate. In Collaboration 2.7, you saw data sets with home prices in which the mean was not a good representation of the data because there were a few very high home prices that made the mean much higher than most of the data. Prices of luxury homes can be 10 or 20 times higher than the price of “average” homes. This makes the mean a poor representation of the data. The range of life expectancy is different because it has more defined limits. As of 2023, the person known to have lived the longest was Jeanne Calment, who died at the age of 122 in 1997.7 This is an extremely high age, but it is rare and represents the maximum possible age known. So, although it is twice an average age in the range of 60–70 years, it would not have much impact on the mean. This indicates that the mean is a fairly accurate way to summarize the data. This is useful when making projections about a large population. This is why life expectancy statistics are used for projecting costs for Social Security. But you should remember that these types of statistics are not always good predictors for individuals.

    After Preparation 4.3 (survey)

    You should be able to do the following things for the next collaboration. Rate how confident you are on a scale of 1–5 (1 = not confident and 5 = very confident).

    Before beginning Collaboration 4.3, you should understand the concepts and demonstrate the skills listed below:

    Skill or Concept: I can …

    Rating from 1 to 5

    understand the meaning and use of variables.

     

    solve for an unknown variable in a linear relationship.

     

    calculate a rate of change (slope) from data.

     

    make a linear model given linear data in context.

     

    _______________________________________

    4 https://www.ssa.gov/news/press/factsheets/HowAreSocialSecurity.htm

    5 http://www.socialsecurity.gov/retire2/agereduction.htm#chart

    6 http://socialsecurity.gov/OACT/TRSUM/index.html

    7 http://en.Wikipedia.org/wiki/Oldest_people


    This page titled 4.3.1: Preparation 4.3 is shared under a CC BY-NC 4.0 license and was authored, remixed, and/or curated by Carnegie Math Pathways (WestEd) .

    • Was this article helpful?