Statistik Ok
Statistik Ok
Statistik Ok
Question Score
Question 1: 18
a. Explain the meaning of factor analysis.
b. State the advantages and disadvantages of factor analysis.
c. State the requirements for factor analysis.
Question 2: 18
An auto rental firm is using 15 identical motors that are adjusted to run at a fixed speed to test
3 different brands of gasoline. Each brand of gasoline is assigned to exactly 5 of the motors.
Eachmotor runs on 10 gallons of gasoline until it is out of fuel. The following represents the
total mileages obtained by the different motors:
Gas 1: 220 251 226 246 260
Gas 2: 244 235 232 242 225
Gas 3: 252 272 250 238 256
Test the hypothesis that the average mileage obtained is not affected by the type of gas used.
Use the 5 percent level of significance.
Question 3: 18
The life of a particular type of generator is thought to be influenced by the material used in its
construction and also by the temperature at the location where it is utilized. The following
table represents lifetime data on 24 generators made from three different types of materials
and utilized at two different temperatures. Do the data indicate that the material and the
temperature do indeed affect the lifetime of a generator? Is there evidence of an interaction
effect?
Question 4: 18
The research results data are given as follows:
Test a hypothesis with standard steps in an ANCOVA design to test the differences in the
means of Y1, Y2, and Y3, by controlling the influence of X1, X2, and X3.
Question 5: 18
Samples of starting annual salaries for individuals entering the public accounting and financial
planning professions follow. Annual salaries are shown in thousands of dollars.
a. Use a .05 level of significance and test the hypothesis that there is no difference
between the starting annual salaries of public accountants and financial planners.
What is your conclusion?
b. What are the sample median annual salaries for the two professions?
Question 6: 10
Summarize an article. Find an article that using the chi-square method and make a detailed
summary (background, basic theory, number of datasets, research results, references) of the
article. Write down the open problem of the article, if any. Example article:
https://www.sciencedirect.com/science/article/abs/pii/S0020025519301550
Penyelesaian :
N Jawaban
o
2. o Merumuskan Hipotesis
Hipotesis yang diuji adalah sebagai berikut:
H 0 : μ1=μ2=μ 3
H 0 : rata-rata jarak tempuh yang diperoleh tidak dipengaruhi oleh jenis bensin yang
digunakan.
H 1: Rata-rata jarak tempuh yang diperoleh dipengaruhi oleh jenis bensin yang digunakan.
α = 0.05
Pengulangan Perlakuan
o Komputasi
[ ]
2 2 2 2
1203 1178 1268 3649
S SB= + + −
5 5 5 15
¿ 863 , 33
n1
S S E= ∑ ¿ ¿
j=1
Menentukan rataan hitung dari data tersebut:
1203+1178+1268
x=
15
¿ 243,2667
¿ 2.854 , 93
S S W =S S E −S S B
¿ 1.991 ,59
MS B
F OBS=
MS W
431,6666
F OBS= =2 , 60
165,9666
o Daerah Kritik
F 0 ,05 ;2 ;12=3 , 89
SS DF MS F Hitung F Tabel
Source of
Variation
o Keputusan uji
o Apakah data ini menunjukkan bahwa material dan suhu memang mempengaruhi umur
generator?
o Apakah ada interaksi antara kedua faktor tersebut?
Penyelesaian :
o Apakah data ini menunjukkan bahwa material dan suhu memang mempengaruhi umur generator?
∑ T 2i
T2
JKK = j=1 −
kn bkn
¿ 2256 , 58
c. Jumlah Kuadrat Kolom (JKK)
k
∑ T 2j
T2
JKK = j=1 −
bn bkn
¿ 31682,6667
d. Jumlah Kuadrat Interaksi Baris Kolom (JK(BK))
b k b k
∑∑T 2
ij ∑ T ∑ T 2j
2
i
T2
i=1 j=1 j=1 j=1
JK ( BK )= − − +
n kn bn bkn
¿ 588 , 08
e. Jumlah Kuadrat Eror (JKE)
JKE=JKT−JKB−JKK −JK ( KB )
¿ 8190
f. Rata-rata Kuadrat
2 JKB JKB
S1 = = =1128, 29
db b−1
2 JKK JKK
S2 = = =31682,6667
db k−1
JK (BK ) JK ( BK )
S23= = =294 ,04
db (b−1)(k −1)
2 JKE JKE
S4 = = =455 , 00
db bk (n−1)
g. F hitung
2
S1
F 1= 2
=2,480
S4
2
S2
F 1= 2
=69 , 63
S4
2
S3
F 1= 2
=0,646
S4
4. Pertanyaan 4:
Data hasil penelitian disajikan sebagai berikut:
Uji hipotesis dengan langkah standar dalam desain ANCOVA untuk menguji perbedaan rerata Y1,
Y2, dan Y3, dengan mengendalikan pengaruh X1, X2, dan X3.
Statistika A1 A2 A3 Jumlah
X Y X Y X Y X Y
n 7 7 7 7 7 7 21 21
∑ Xi ∑Yi 33 27 44 47 52 64 129 138
∑ X 21 ∑ Y 21 159 107 282 323 396 590 837 1020
∑ x 21 ∑ y12 3,43 2,86 5,43 7,43 9,71 4,86 18,57 15,14
Xi Yi 4,71 3,86 6,29 6,71 7,43 9,14 6,14 6,57
∑ XY 130 301 482 913
∑ xy 2,71 5,57 6,57 14,86
¿ 50,4285
a
JP ( D )=∑ . ¿
n=1
¿ 14 , 86
JK X ( T )=∑ X −
2
t
nt
¿ 44,5714
{ (∑ X i )
} (∑ X i )
2 2
a
JK X ( A ) =∑ −
i=1 ni nt
¿ 26
{∑ }
2
a
( ∑ Xi)
J K X ( D )=∑
2
X− i
i =1 ni
¿ 18 , 57
JK y (T )=∑ Y −
2
t
nt
¿ 113,1429
{ (∑ Y i)
} (∑ Y i )
2 2
a
JK y ( A )=∑ −
i=1 ni nt
¿ 98
{∑ }
2
a
(∑ Y i )
J K y ( D )=∑
2
Y − i
i=1 ni
¿ 15 , 14
d. Koefisien regresi
JP (T ) 65,2857
b xy ( T ) = = =1,4647
JK x (T ) 44,5714
JP( A ) 50,4285
b xy ( A )= = =1,9395
JK x ( A) 26
JP (D) 14 , 86
b xy ( A )= = =0 , 8
JK x (D) 18 ,57
e. Jumlah Kuadrat Regresi (JKreg)
JK reg (T )=b xy ( T ) . JP (T )
¿ ( 1,4647 ) ( 65,2857 )=95 , 62
JK reg (A )=b xy ( A ) . JP( A)
¿ ( 1,9395 ) ( 50,4285 )=97 , 80
JK reg (D)=b xy ( D ) . JP (D)
¿ ( 0 , 8 ) ( 14 , 86 )=11,888
f. Jumlah Kuadrat Y Residu (JKres)
JK res ( T )=JK y (T )−JK reg ( T )
¿ 17,516
JK res ( A ) =JK y ( A )−JK reg ( A )
¿ 0,190
JK res ( D )=JK y ( D )−JK reg ( D )
¿ 3 , 26
g. Menentukan Derajat Bebas (db) sumber varians total, dalam dan antar
Db res (T) = nt-m-1=21-1-1= 19
Db res (A) = 3-1=2
Db res (D)=19-2=17
h. Menyusun table Ancova
Sumber Total Dalam Antar
JK xy 65,2857 14 , 86 50,4285
JK x 44,5714 18 , 57 26
JK y 113,1429 15 , 14 98
b xy 1,4647 0,8 1,9395
JK regresi 95 , 62 11,888 97 , 80
JK residu 17,516 3 , 26 0,190
db 21 17 2
RJK residu 0,834 0,191 0,095
rankin Rankin
PA FP
g g
50,2 16 48,9 20
50,9 15 49 19
51,9 12,5 49,2 18
54,2 8 49,7 17
55 7 51,8 14
56,3 5 51,9 12,5
57 4 53,1 11
58,2 3 53,6 10
58,8 2 53,9 9
59,5 1 55,9 6
Jumlah jumlah
K1 73,5 K2 136,5
n1=10, n2= 10
3) Menghitung statistic U melalui dua rumus
n1 (n1+ 1)
pertama U=n1 n 2+ −K 1
2
¿ 81 , 5
n2 (n2 +1)
kedua U =n1 n2 + −K 2
2
¿ 18 , 5
Nilai U ditentukan oleh nilai terkecil, sehingga U=18,5
4) Membuat kesimpulan