Refere Referencia: ncia: Estadís Estadísca ca para administ administrac ración ión y economía, economía, Anderson Anderson De Ejer Ejerci cici cio o 8 Capí apítul tulo 19 19 En una muestra de 1! pardos de 75suet7ol uni6ersitario, uni6ersitario, el euipo de casa 0anó 98 pardos Realice una prue7a para determinar si los datos sustentan sustentan la ipótesis de ue en el 75suet7ol uni6ersitario el euipo de casa ene 6entaja A u; conclusión se lle0a con con < # !,!= ! ,!= Desarrollo:
1!
n=
"# "# "#
!,$n !,$1!
'(!,)$n* '(!,)$n* +1)-%).-%
%
/ara 98, si0nos 2# 2#
(983%*4+,1)-%).-+9%9 -%88.)%)
/ara 2 # -,%+, el 5rea en la cola es menor de !,!!1 Con dos colas, p36alor es menor de !,!!) !,!! ) Dado que P-valor P-valor ≤ 0,05 , se rechaza Ho. Se concluye concluye que si existe existe una ventaa ventaa !ara el equi! equi!
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local
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Refere Referencia: ncia: Estadís Estadísca ca para administ administrac ración ión y economía, economía, Anderson Anderson De Ejer Ejerci cici cio o + Capí apítul tulo 19 19
En el mercado de las computadoras personales personales la competencia es intensa En una muestra de !! compras, se encontró ue )!) eran compras de marca A, 18 de marca y 1.! de otras marcas Con un ni6el de si0niBcancia de !! prue7e la ipótesis de ue las marcas A y enen la misma parcipacción en el mercado de las computadoras computadoras personales Cu5l es la conclusión=
n# n#
)!)18
"# "#
!,$-+!
'(!,)$n* '(!,)$-+!* 9.8+8-)981
-+!
18!
>sando la marca A ?# 2# 2#
)!)
()!)318!*49,.8+8-)98!!1. )-19!!-+1%
@rea @rea col colaa # !,3 !,3!, !,.8 .898 98 @rea cola # !!1!) p 6alor # p 6alor #
!,!1!)$) !!)!.
"o#o "o#o P- valo valorr es es #en #enor or de 0,05 0,05,, se rech rechaz aza a Ho. Ho. $ se se con concl cluy uye e que que las las #arc #arcas as %ene %enen n !ar !ar%c %ci! i!
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aciones dis%ntas en el #ercado
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Refere Referencia: ncia: Estadís Estadísca ca para administ administrac ración ión y economía, economía, Anderson Anderson De Ejerc Ejercici icio o 18 Capítu Capítulo lo 19
/ara pro7ar el efecto de dos adi6os so7re el rendimiento de la 0asolina, siste automó6iles usan el adi6o 1 y nue6e automó6iles el adi6o ) En los datos si0uientes se presenta el rendimiento en millas por 0alón o7tenidocon cada uno de los dos adi6os >se <#!,! y la prue7a de para determinar si e?iste una diferencia si0niBca6a en el efecto ue enen los dos adi6os so7re el rendimiento Adit Aditiv ivo o1
Adit Aditiv ivo o2
MPG
MPG
17.3
18.7
18.4
17.8
19.1
21.3
16.7
21.0
18.2
22.1
18.6
18.7
17.5
19.8 20.7 20.2
Desarrollo:
Additive 1 MPG
Suma =
Additive 2
Rank
MPG
Ran
17.3
2
18.7
k 8.5
18.4
6
17.8
4
19.1
10
21.3
15
16.7
1
21.0
14
18.2
5
22.1
16
18.6
7
18.7
8.5
17.5
3
19.8
11
34
20.7
13
20.2
12
Suma =
85
Ranueando las muestras simples com7inadas y encontrando la suma para cada muestra
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l # u# u#
.1 %$(%91*3.1 %8
Dado ue # -. F .1, . 1, se recaGa Ho "onclusi&n "onclusi&n:: si exist existe e una una di'er di'erencia encia si(ni)ca% si(ni)ca%va va en en el e'ecto e'ecto que %enen %enen los los dos adi%vos adi%vos so
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*re el rendi#iento
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Refere Referencia: ncia: Estadís Estadísca ca para administ administrac ración ión y economía, economía, Anderson Anderson De Ejerc Ejercici icio o ) Capítu Capítulo lo 19
Ia Jaonal Jaonal Associa Associaon on of Home Home uiders uiders propo proporci rciona ona datos datos so7re so7re los los m5s frecuen frecuentes tes proye proyecc remo remode dela laci ción ón >se >se la prue prue7a 7a de par paraa det deter ermi mina narr si si se se pue puede de conc conclu luir ir ue ue el el cos costo to de remo remo una cocina diBera del costo de remodelación de una rec5mara rec5mara >se !! como ni6el de si0niB
Coina
Re!ma"a
25.2
18
17.4
22.9
22.8
26.4
21.9
24.8
19.7
26.9
23
17.8
19.7
24.6
16.9
21
21.8 23.6
Ranueando
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De la ta7la l# > # > # > #
%n1$(n1n)1*3l 1!$(1!81*3%11%
Ke recaGaría Ho Ki F%- o si L 11% /ara #8), no se recaGa "onclusi&n: +o hay di'erencia si(ni)ca%va entre los costos !ara cocina y rec#ara
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os de elación de cancia
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Refere Referencia: ncia: Estadís Estadísca ca para administ administrac ración ión y economía, economía, Anderson Anderson De Ejerc Ejercici icio o )8 Capítu Capítulo lo 19
/ara 7ajar de peso 7asta con praccar una de las si0uientes ac6idades tres 6eces por semana durante cuarenta minutos En la ta7la si0uiente se muestra la candad de calorías ue se uema con .! minutos de cada una de estas ac6idades Estos datos indican ue e?ista diferencia en la candad de calorías uemadas con cada una de estas ac6idades= D; su conclusión
$atai%n
&eni'
Anda" en i(a i(a
408
415
38 5
380
485
25 0
425
450
29 5
400
420
40 2
427
530
26 8
Desarrollo: $atai%n
Rank
&eni'
Rank
Anda" en i(a i(a
408
8
415
9
385
380
4
485
14
250
425
11
450
13
295
400
6
420
10
402
427
12
530
15
268
Sum
# #
41
61
((1)4 1)4(1$( 1$(1 11*** 1***$( $(((.1M .1M)4* )4*(+1M +1M)4* )4*(18M (18M)4 )4* ****3( *3(-$( -$(11 11*** 9)+
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Rank 5 1
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Refere Referencia: ncia: Estadís Estadísca ca para administ administrac ración ión y economía, economía, Anderson Anderson De Ejerc Ejercici icio o -1 Capítu Capítulo lo 19
Ios dulces m5s 6endidos enen mucas calorías Ios datos si0uientes muestran el contenido de calorías en muestras de , Tit Tat y ilUy ay VV /rue7e si ay una diferencia si0niBca6a en el contenido de calorías de estos tres dulces Emplee como ni6el de si0niBcancia !!, cu5l es su conclusión=
SK )-! )1! ).! )! )-! 11+!
Tit Tat )) )! ). )- ))! 11-!
ilUi ay VV )!! )!8 )!) 19! 18! 98!
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Refe Refere renci ncia: a: Ejer Ejerci cici cio o 1+,) 1+,). .
/ro7a7 /ro7a7ililida idad d y est estadí adís sca ca para para in0en in0enier iería ía y cienc ciencias ias,, alp alpole ole yer yers, s, 8a 8a edici edición ón Capí Capítu tulo lo 1+
Ke uliGa un proceso de plateado para cu7rir cierto po de carola de ser6icio Cuando el proceso est5 7ajo control, el espesor de la plata so7re la carola 6ariar5 de forma aleatoria si0uiendo una distri7ución normal con una media de !!) milímetros y una des6iación est5ndar de !!! milímetros Kupon0a Kupon0a ue las si0uientes 1) carolas e?aminadas muestran los si0uientes espesores de plata: !!19, !!)1, !!)!, !!19, !!)!, !!18, !!)-, !!)1, !!)., !!)), !!)-, !!)) >lice la prue7a de corridas para determinar si las W uctuaciones en el espesor de una carola a otra son aleatorias aleatorias Kea < # !!
Desarrollo:
Ho: H1:
Ias Wuctuaciones son randómicas Ias Wuctuaciones no son randómicas
< # !! /rue7a estadísca: X, nYmero total de corridas C5lculos: /ara secuencia dada:
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Refe Refere renci ncia: a: Ejer Ejerci cici cio o 1+,) 1+,)+ +
/ro7a7 /ro7a7ililida idad d y est estadí adís sca ca par paraa in0en in0enier iería ía y cienci ciencias, as, alpo alpole le ye yers rs,, 8a edic edición ión Capí Capítu tulo lo 1+ 1+
En una línea de producción industrial, los ar\culos se inspeccionan de forma periódica en 7usca de defectuosos Io si0uiente es una secuencia de ar\culos defectuosos, D, y no defectuosos, J, producidos por esta línea: DDJJJDJJDDJJJJJDDDJJDJJJJDJD >lice la teoría de muestras 0randes para la prue7a de corridas, con un ni6el de si0niB cancia de !!, para determinar si los defectuosos ocurren o no al aGar
Desarrollo:
Ke plantean las ipótesis: Ho: H1:
Ios defectuosos ocurren aleatoriamente Ios defectuosos no ocurren aleatoriamente
< # !! Re0i Re0ión ón crí críca ca::
2F31 2F31,9 ,9+ + o 2L1 2L1,9 ,9+ +
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Refere Referencia: ncia: Estadís Estadísca ca para administr administración ación y economía economía Ie6in Ie6in Ru7in alderas, alderas, s;pma s;pma edic Ejerc Ejercici icio o 1.,.. 1.,.. Capítu Capítulo lo 1.
Ia si0uiente es una distri7ución de frecuencias o7ser6adas o7ser6adas >lice la distri7ución normal con "# 98+ y -%8 a* Encuentre la pro7a7ilidad de caer en cada clase
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Refe Refere renci ncia: a: Ejer Ejerci cici cio o 1.,. 1.,.. .
Estad Estadís ísca ca para para admini administ stra ració ción n y econom economía ía Ie6in Ie6in Ru7in Ru7in alder alderas, as, s;pma s;pma edic edic Capí Capítu tulo lo 1.
Te6in or0an, 0erente nacional de 6entas de una compa^ía de electrónica, a reca7ado la si0uiente estadísca de salarios de los in0resos de la fuerGa de 6entas en su campo _l ene tanto las frecuencias o7ser6adas como las frecuencias esperadas si la distri7ución de salarios es normal Al ni6el de si0niBcancia de !1!, puede concluir Te6in ue la distri7ución de los in0resos de la fuerGa de 6entas es normal=
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