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Estadística Aplicada para Turismo: Problemas y Soluciones, Exámenes de Estadística

Una serie de problemas y soluciones correspondientes al curso de Estadística Aplicada para Turismo en la Facultad de Economía Financiera y Contabilidad e Idioma Moderno. Los problemas abarcan desde el procesamiento de datos agrupados e individuales hasta el cálculo de medidas de tendencia central, dispersión, regresión lineal y covarianza.

Tipo: Exámenes

2019/2020

Subido el 10/06/2020

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Facultad de Economía Financiera y Contabilidad e Idioma Moderno
TEST: APPLIED STATISTICS FOR TOURISM
Surname, Name: DNI/Passport:
Degree:
Group: Date:
Instructions:
Answer the question on the space between problems, you may ask for more
paper if you need. There are 6 problem each one counts the same and also each question within.
APPLIED STATISTICS FOR TOURISM
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TEST: APPLIED STATISTICS FOR TOURISM

Surname, Name: DNI/Passport:

Degree:

Group: Date:

Instructions: Answer the question on the space between problems, you may ask for more paper if you need. There are 6 problem each one counts the same and also each question within.

Ungroup data dAe means the rst integer above A

¯x =

∑^ n i=

xi ni N S

(^2) x = σ x (^2) =

∑^ n i=

(xi − ¯x)^2 ni N

S x^2 = σ^2 x =

∑^ n i=

x^2 i ni N −^ (¯x)

(^2) Me =

  

x((N +1)/2), if N is odd. x(N/2) + x(N/2+1) 2 ,^ if^ N^ is even.

Mo = possibility with thr biggest frequency Qi = x(diN/ 4 e),

Di = x(diN/ 10 e), Pi = x(diN/ 100 e),

Group data (x′ i is the middle point)

¯x = E(x) =

∑^ n i=

x′ i ni N S

(^2) x = σ x (^2) =

∑^ n i=

(x′ i − ¯x)^2 ni N

S x^2 = σ^2 x =

∑^ n i=

(x′ i)^2 ni N −^ (¯x)

2 Me^ =^ a^ +^

N/ 2 − Ni− 1 Ni − Ni− 1 (b^ −^ a) where i comes form the chosen interval [a, b]

Mo = possibility with highest density, the density is di = (^) b n−i a Qk^ =^ x(kN/4)^ =^ a^ +^

kN/ 4 − Ni− 1 Ni − Ni− 1 (b^ −^ a),

Dk = x(kN/10) = a + kN/ Ni^10 −^ −N^ iN− 1 i−^1 (b − a), Pk = x(kN/100) = a + kN/ N^100 i − N−i^ −N 1 i−^1 (b − a),

Alternative notation and formulas intervals ⇒]a, b] =]li− 1 , li]

Me = li− 1 + N/ Ni^2 −^ − N^ Ni−i− 11 (li − li− 1 ) Me = li− 1 + N/^2 − ni^ Ni−^1 ci

¯x = E(x) =

∑^ n i=

x′ i fi S^2 x = σ^2 x =

∑^ n i=

(x′ i)^2 fi − (¯x)^2

Problem 1: Given the data: − 1 0 1 2 1 − 1 − 2 − 1 −2 2 − 1 − 2 − 1 − 2 − 2 1 0 0 1 1 − 1 0 1 2 1 − 1 − 2 − 1 −1 2 − 1 − 1 0 1 0 2 2 2 1 1

  1. a) Make an ungroup data table with at least the absolute frequency.
  2. b) Obtain the mean, the median and the mode.

Solution For a), we have xi -2 -1 0 1 - ni 6 11 6 10 7 For b), we have x ¯ =

, Me = 0, Mo = − 1

Problem 2: Given the data: 11 22 23 42 52 60 54 18 42 25 22 40 16 27 47 26 15 18 29 12 37 27 28 39 40 12 11 32 49 39

  1. a) Make a group data table (at least the absolute frequency) with the intervals ]10, 16], ]16, 26], ]26, 35], ]35, 42] and ]42, 60].
  2. b) Obtain the mean, the median and the mode.

Solution For a), we have xi ]10, 16] ]16, 26] ]26, 35] ]35, 42] ]42, 60] ni 6 7 5 7 5 For b), we have

¯x =

, Me = 29. 6 , Mo =]10, 16] and ]26, 35]

Problem 4: Given the data x ¯ = − 3 , y¯ = 3, σ x^2 = 49, σ^2 y = 36, σxy = 40

  1. a) Find the regression lines and Pearson's coecient.
  2. b) Which are the estimation for the variable y at the values x 1 x 2 x 3 x 4 x 5 x 6 0 1 2 3 4 5 Solution For a), we have

˜x + 3 =

(y − 3), y˜ − 3 =

(x + 3), ρ =

For b), we have y ˜ 1 y˜ 2 y˜ 3 y˜ 4 y˜ 5 y˜ 6 267/49 307/49 347/49 387/49 427/49 467/

Problem 5: Given the values for the variables X, Y and Z: x 0 x 1 x 2 x 3 x 4 x 5 x 6 3 11 7 3 6 9 5

y 0 y 1 y 2 y 3 y 4 y 5 y 6 2 11 9 15 3 6 2

z 0 z 1 z 2 z 3 z 4 z 5 z 6 4 14 18 19 20 21 8

  1. a) Obtain the index numbers with base years x 1 , y 1 and z 1.
  2. b) Obtain the chain of index numbers and conclude for which period and variable we have the most decrease with respect to the previous year. Solution For a), we have Ix(0) Ix(1) Ix(2) Ix(3) Ix(4) Ix(5) Ix(6) 3/11 1 7/11 3/11 6/11 9/11 5/

Iy(0) Iy(1) Iy(2) Iy(3) Iy(4) Iy(5) Iy(6) 2/11 1 9/11 15/11 3/11 6/11 2/

Iz (0) Iz (1) Iz (2) Iz (3) Iz (4) Iz (5) Iz (6) 4/14 1 18/14 19/14 20/14 21/14 8/ For b), we have ICx(1) ICx(2) ICx(3) ICx(4) ICx(5) ICx(6) 11/3 7/11 3/7 6/3 9/6 5/

ICy(1) ICy(1) ICy(2) ICy(3) ICy(3) ICy(6) 11/2 9/11 15/9 3/15 6/3 2/

ICz (1) ICz (2) ICz (3) ICz (4) ICz (5) ICz (6) 14/4 18/14 19/18 29/19 21/20 8/ The lowest is 3/15, this is y the 4 period (y 4 /y 3 )